Synonyms: Androst-4-ene-17b-carboxylic acid, 11b,18-dihydroxy-3-oxo-, g-lactone (6CI,7CI,8CI);1H,3H-Naphth[2',1':4,5]indeno[1,7a-c]furan, androst-4-ene-17-carboxylic acidderiv.; 11b,18-Dihydroxy-4-androsten-3-one-17b-carboxylic acid 20®18 lactone; 11b,18-Dihydroxy-4-androsten-3-one-17b-carboxylic acid lactone (20®18)