121055-10-5 2H-1-Benzopyran-6-carbonitrile, 3,4-dihydro-3-hydroxy-2,2-dimethyl-4-((3-oxo-1-cyclopenten-1-yl)oxy)- (3S-trans)- 3,4-Dihydro-3-hydroxy-2,2-dimethyl-4-(3-oxo-cyclopent-1-enyloxy)-2H-1-benzopyran-6-carbonitrile Sdz pco 400 Sdz pco-400