88197-30-2 Spiro(2H-1-benzopyran-2,2'-bicyclo(3.1.1)heptane)-6,8-dicarboxaldehyde,3,4-dihydro-5,7-dihydroxy-6',6'-dimethyl-4-(2-methylpropyl)-, (1'R,2R,4R,5'S)-