(1S,5R,6R,7R)-(E)-3-(1,4-dimethoxycarbonyl-1-butylidene)-6-(3-oxo-E-1-octenyl)-7-tetrahydropyranyloxy-2-oxabicyclo<3.3.0>octane

(1S,5R,6R,7R)-(E)-3-(1,4-dimethoxycarbonyl-1-butylidene)-7-hydroxy-6(3(S)-hydroxy-E-1-octenyl)-2-oxabicyclo<3.3.0>octane