754816 -OEChem-02060822472D 1 0 0 0 0 0 0 0 0999 V2000 5.8115 -3.7905 0.0000 Se 1 0 0 0 0 15 0 0 0 0 0 0 M ISO 1 1 81 M END > 0 > 0 > 754816 > 3 > ChemIDplus > 015422589 > 15422-58-9 81Se Selenium, isotope of mass 81 Selenium-81 > 15422-58-9 > 015422589 > http://chem.sis.nlm.nih.gov/chemidplus/ > http://chem.sis.nlm.nih.gov/chemidplus/direct.jsp?result=advanced®no=015422589 > 6337578 1 $$$$