754900 -OEChem-02060822472D 1 0 0 0 0 0 0 0 0999 V2000 5.8924 -3.6037 0.0000 Pa -3 0 0 0 0 0 0 0 0 0 0 0 M ISO 1 1 228 M END > 0 > 0 > 754900 > 3 > ChemIDplus > 015766093 > 15766-09-3 228Pa Protactinium, isotope of mass 228 Protactinium-228 > 15766-09-3 > 015766093 > http://chem.sis.nlm.nih.gov/chemidplus/ > http://chem.sis.nlm.nih.gov/chemidplus/direct.jsp?result=advanced®no=015766093 > 177680 1 $$$$