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Search and share chemistry" id="rsc-mobile-header-title" width="256" data-v-7724c9dd></a><img src="/_nuxt/navIcon.10bd7823.svg" alt="nav-icon" loading="lazy" role="button" data-v-7724c9dd data-v-904515e6></div></header></div><div id="header-desktop" class="desktop" data-v-7724c9dd><header data-v-7724c9dd><div class="header-logo-image" data-v-7724c9dd><div class="logo" data-v-7724c9dd><a href="/" class="" data-v-7724c9dd><img src="/_nuxt/ChemSpider_Desktop-Black_247x72px.1dfe4f60.svg" alt="ChemSpider Search and share chemistry" id="rsc-header-title" width="235" height="72" style="margin-right:10px;" data-v-7724c9dd></a></div><a href="https://www.rsc.org/" data-v-7724c9dd><img src="/_nuxt/rsc-logo.612f2972.webp" alt="Royal Society of Chemistry" id="rsc-header-logo" width="258" height="72" data-v-7724c9dd></a></div><div class="navigation-items" data-v-7724c9dd><ul class="nav-list" data-v-7724c9dd><a href="/search" class="" id="menu-simple" data-v-7724c9dd><li class="nav-item" data-v-7724c9dd>Simple</li></a><a href="/StructureSearch" class="" id="menu-structure" data-v-7724c9dd><li class="nav-item" data-v-7724c9dd>Structure</li></a><a href="/AdvancedSearch" class="" id="menu-advanced" data-v-7724c9dd><li class="nav-item" data-v-7724c9dd>Advanced</li></a></ul></div></header></div><div class="sidenav-container" data-v-c6aa881c data-v-b3571781></div><div class="all" data-v-c6aa881c><section class="divisor" data-v-c6aa881c><div class="result-sections" data-v-73ca4b19><div class="result-content" data-v-73ca4b19><div class="result-item" data-v-73ca4b19><div class="mobile-block" data-v-73ca4b19><div class="compound-title" data-v-73ca4b19><h4 class="ellipsis" id="cmp-title-label-mobile" data-v-73ca4b19>2H-Pyrazolo[4,3-d]pyrimidine</h4></div></div><div class="item-image" data-v-73ca4b19><div id="div-svg" data-v-73ca4b19></div></div><div class="info-buttons-mobile" data-v-73ca4b19><button id="button-download-mobile" class="button darkblue-button button1" data-v-73ca4b19>Download .mol <img class="download-icon" src="/_nuxt/download.18c2a6e1.svg" alt="download-icon" data-v-73ca4b19></button><button id="button-cite-record-mobile" class="button darkblue-button button2" data-v-73ca4b19><span data-v-73ca4b19><a style="color:inherit;text-decoration:none;" data-v-73ca4b19></a><img class="download-icon" src="/_nuxt/blankPage.8f22336f.svg" alt="download-icon" loading="lazy" data-v-73ca4b19></span></button></div><div class="info-buttons-mobile" data-v-73ca4b19><a href="https://legacy.chemspider.com/Chemical-Structure.10466972.html" target="_blank" style="text-decoration:none;" class="button white-button button3" data-v-73ca4b19><button id="button-download-mobile" data-v-73ca4b19>Go to legacy record </button></a></div><div class="item-info" data-v-73ca4b19><div class="info-text" data-v-73ca4b19><div class="compound-title" data-v-73ca4b19><h5 class="ellipsis" id="cmp-title-label" data-v-73ca4b19>2H-Pyrazolo[4,3-d]pyrimidine</h5></div><span class="report-error-mobile" data-v-73ca4b19><button id="button-report-error-mobile" class="button white-button" data-v-73ca4b19><img class="download-icon" src="/_nuxt/infoDarkBlue140.ea80f8c6.svg" loading="lazy" alt="download-icon" data-v-73ca4b19></button></span><table class="" data-v-73ca4b19><tr data-v-73ca4b19><td class="header" id="molecular-fml-label" data-v-73ca4b19>Molecular formula:</td><td class="molecular-formula" id="molecular-fml-value" data-v-73ca4b19>C<span style='vertical-align:sub'>5</span>H<span style='vertical-align:sub'>4</span>N<span style='vertical-align:sub'>4</span></td></tr><tr data-v-73ca4b19><td class="header" id="avg-mass-label" data-v-73ca4b19>Average mass:</td><td id="avg-mass-value" data-v-73ca4b19>120.115</td></tr><tr data-v-73ca4b19><td class="header" id="monoisotopic-mass-label" data-v-73ca4b19>Monoisotopic mass:</td><td id="monoisotopic-mass-value" data-v-73ca4b19>120.043596</td></tr><tr data-v-73ca4b19><td class="header" id="cmp-id-label" data-v-73ca4b19>ChemSpider ID:</td><td id="cmp-id-value" data-v-73ca4b19>10466972</td></tr></table><div class="icons-container" data-v-73ca4b19></div></div><div class="info-buttons-desktop" data-v-73ca4b19><button id="button-download" class="button darkblue-button" data-v-73ca4b19> Download .mol <img class="download-icon" src="/_nuxt/download.18c2a6e1.svg" alt="download-icon" loading="lazy" data-v-73ca4b19></button><button id="button-cite-record" class="button darkblue-button" data-v-73ca4b19> Cite this record <img class="download-icon" src="/_nuxt/blankPage.8f22336f.svg" alt="download-icon" loading="lazy" data-v-73ca4b19></button><a href="https://legacy.chemspider.com/Chemical-Structure.10466972.html" target="_blank" style="color:inherit;text-decoration:none;" data-v-73ca4b19><button id="button-download" class="button white-button" data-v-73ca4b19>Go to legacy record</button></a></div></div><span class="report-error" data-v-73ca4b19><button id="button-report-error" class="button white-button button-report-error" data-v-73ca4b19><img class="download-icon" src="/_nuxt/infoDarkBlue140.ea80f8c6.svg" alt="download-icon" loading="lazy" data-v-73ca4b19></button></span></div></div><div class="notification-banner" data-v-73ca4b19 data-v-b3a4af68><div class="text" id="banner-content" data-v-b3a4af68><span data-v-b3a4af68><img class="x-icon" src="/_nuxt/infoButton.f4d11efd.svg" alt="info-icon" loading="lazy" data-v-b3a4af68></span> </div></div><div id="top" data-v-73ca4b19></div><div class="v-expansion-panels v-theme--light v-expansion-panels--variant-default expansion-panels" id="accordion-structural-identifiers" data-v-73ca4b19 data-v-79d9d332><div class="v-expansion-panel" style="" aria-expanded="false" data-v-79d9d332><div class="v-expansion-panel__shadow"></div><button class="v-expansion-panel-title expansion-panel-title" style="" type="button" aria-expanded="false" id="accordion-structural-identifiers-title" data-v-79d9d332><span class="v-expansion-panel-title__overlay"></span><div class="title disabled-accordion-title" data-v-79d9d332><img class="plus-icon" src="/_nuxt/Plus.fed13eb2.svg" alt="plus-icon" loading="lazy" data-v-79d9d332><img class="less-icon" src="/_nuxt/Less.4b527497.svg" alt="less-icon" loading="lazy" data-v-79d9d332><span data-v-79d9d332>Structural identifiers</span><div class="line" data-v-79d9d332></div></div><span class="v-expansion-panel-title__icon"><i class="none mdi v-icon notranslate v-theme--light v-icon--size-default" style="" aria-hidden="true"></i></span></button><div class="v-expansion-panel-text" style="display:none;" data-v-79d9d332></div></div></div><div data-v-73ca4b19><div class="item-options" data-v-b98185ac><ul class="options-list" data-v-b98185ac><li class="option-active option" id="tab0" data-v-b98185ac>Names <span data-v-b98185ac><img src="/_nuxt/downArrow.e3348a8d.svg" alt="down_Arrow" loading="lazy" class="drop-down-icon" data-v-b98185ac></span></li></ul></div><div class="selected-component" data-v-b98185ac><section class="names" data-v-b98185ac data-v-3ad33253><div class="accordion-margins" data-v-3ad33253><div class="v-expansion-panels v-theme--light v-expansion-panels--variant-default expansion-panels" id="Names-Accordion-0" data-v-3ad33253 data-v-79d9d332><div class="v-expansion-panel v-expansion-panel--active" style="" aria-expanded="true" data-v-79d9d332><div class="v-expansion-panel__shadow"></div><button class="v-expansion-panel-title v-expansion-panel-title--active expansion-panel-title" style="" type="button" aria-expanded="true" id="accordion-names-and-synonyms-title" data-v-79d9d332><span class="v-expansion-panel-title__overlay"></span><div class="title enabled-accordion-title" data-v-79d9d332><img class="plus-icon" src="/_nuxt/Plus.fed13eb2.svg" alt="plus-icon" loading="lazy" data-v-79d9d332><img class="less-icon" src="/_nuxt/Less.4b527497.svg" alt="less-icon" loading="lazy" data-v-79d9d332><span data-v-79d9d332>Names and synonyms</span><div class="line" data-v-79d9d332></div></div><span class="v-expansion-panel-title__icon"><i class="none mdi v-icon notranslate v-theme--light v-icon--size-default" style="" aria-hidden="true"></i></span></button><div class="v-expansion-panel-text" data-v-79d9d332><div class="v-expansion-panel-text__wrapper"><div class="names-and-synonyms" name="Names and synonyms" data-v-79d9d332 data-v-176fa3f8><h5 id="verified-synonyms-label" data-v-176fa3f8>Verified</h5><p class="result" id="verified-synonym-272-57-1" data-v-176fa3f8>272-57-1 <span class="flag" id="verified-synonym-272-57-1-RN" data-v-176fa3f8> [RN] </span></p><p class="result" id="verified-synonym-2h-pyrazolo[4,3-d]pyrimidin" data-v-176fa3f8>2H-Pyrazolo[4,3-d]pyrimidin <span class="flag" data-v-176fa3f8> [German] </span><span class="flag" id="verified-synonym-2h-pyrazolo[4,3-d]pyrimidin-ACD/IUPAC Name" data-v-176fa3f8> [ACD/IUPAC Name] </span></p><p class="result" id="verified-synonym-2h-pyrazolo[4,3-d]pyrimidine" data-v-176fa3f8>2H-Pyrazolo[4,3-d]pyrimidine <span class="flag" id="verified-synonym-2h-pyrazolo[4,3-d]pyrimidine-ACD/IUPAC Name" data-v-176fa3f8> [ACD/IUPAC Name] </span><span class="flag" id="verified-synonym-2h-pyrazolo[4,3-d]pyrimidine-ACD/Index Name" data-v-176fa3f8> [ACD/Index Name] </span></p><p class="result" id="verified-synonym-2h-pyrazolo[4,3-d]pyrimidine" data-v-176fa3f8>2H-Pyrazolo[4,3-d]pyrimidine <span class="flag" data-v-176fa3f8> [French] </span><span class="flag" id="verified-synonym-2h-pyrazolo[4,3-d]pyrimidine-ACD/IUPAC Name" data-v-176fa3f8> [ACD/IUPAC Name] </span></p><h5 id="unverified-synonyms-label" data-v-176fa3f8>Unverified</h5><p class="result" id="unverified-synonym-272-55-9" data-v-176fa3f8>272-55-9 <span class="flag" data-v-176fa3f8> [RN] </span></p><p class="result" id="unverified-synonym-3198" data-v-176fa3f8>3198 <span class="flag" data-v-176fa3f8> [Beilstein] </span></p><p class="result" id="unverified-synonym-mfcd18251004" data-v-176fa3f8>MFCD18251004 <span class="flag" data-v-176fa3f8> [MDL number] </span></p></div></div></div></div></div></div><div class="accordion-margins" data-v-3ad33253></div></section></div></div></div><aside data-v-c6aa881c data-v-33bcf64e><div class="side-advertisement" data-v-33bcf64e><h6 data-v-33bcf64e>Advertisement</h6><div id="div-gpt-ad-1708699449485-0" style="min-width:300px;min-height:250px;" data-v-33bcf64e></div></div><div class="side-advertisement" data-v-33bcf64e><h6 data-v-33bcf64e>Spotlight</h6><div id="div-gpt-ad-1708699706095-0" style="min-width:300px;min-height:250px;" data-v-33bcf64e></div></div><div class="side-advertisement" data-v-33bcf64e><h6 data-v-33bcf64e>Advertisement</h6><div id="div-gpt-ad-1708699926144-0" style="min-width:300px;min-height:100px;" data-v-33bcf64e></div></div></aside></section></div><footer class="rsc-footer" data-v-c6aa881c data-v-5c00c65e><div class="footer-navigation-items" data-v-5c00c65e><ul class="nav-list" data-v-5c00c65e><a 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