2-Cyclopentene-1-carboxylic acid, 3,5-dichloro-1-hydroxy-4-oxo-2-(1-propenyl)-, methyl ester, [1S-[1.alpha.,2(E),5.beta.]]- 2-Cyclopentene-1-carboxylic acid, 3,5-dichloro-1-hydroxy-4-oxo-2-propenyl-, methyl ester, (E)-(1S,5S)-(+)- 25707-30-6 CRYPTOSPORIOPSIN NSC137442