triterpene terpenoid fundamental parent ursane 0 412.407 412.73388 Beilstein:3207208 C30H52 CHEBI:35711 InChI=1S/C30H52/c1-20-12-16-27(5)18-19-29(7)22(25(27)21(20)2)10-11-24-28(6)15-9-14-26(3,4)23(28)13-17-30(24,29)8/h20-25H,9-19H2,1-8H3/t20-,21+,22-,23+,24-,25+,27-,28+,29-,30-/m1/s1 OOTXFYSZXCPMPG-BMYLZFHVSA-N [H][C@]12CC[C@]3([H])[C@@]4(C)CCCC(C)(C)[C@]4([H])CC[C@@]3(C)[C@]1(C)CC[C@@]1(C)CC[C@@H](C)[C@H](C)[C@@]21[H] chebi_ontology ursane