(2S,4aR,4bS,6aS,13aS,13bR)-2-hydroxy-4a,6a-dimethyl-2,3,4,4a,4b,5,6,6a,13,13a,13b,14-dodecahydro-1H-naphtho[2',1':4,5]indeno[1,2-b]quinoline-12-carboxylic acid