4b,4b,5,5,6,6,7,7,8,8,8a,8a,9,9,10,10-Hexadecahydro-2,2-dihydroxy-4b,4b,8,8-tetramethyl-1,1-bis(1-methylethyl)-3,3-biphenanthrene-8,8-dicarboxylic acid