Synonyms: 24-Nor-16,17-secochol-3-ene-16,23-dioicacid, 11-(acetyloxy)-7,21-dihydroxy-4,8-dimethyl-1,17-dioxo-, g-lactone d-lactone, (5a,7a,11a,13a,14b,20R)-; Phenanthro[10,1-bc]pyran,24-nor-16,17-secochol-3-ene-16,23-dioic acid deriv.; Klaineanolide B