38704-36-8 7-Ethylidene-1a alpha,2,3,7-tetrahydrocyclopent(b)oxireno(c)piperiidine 7-Ethylidenecyclopent(b)oxireno(c)pyridine hexahydro deriv. Cyclopent(b)oxireno(c)pyridine, 7-ethylidene-, hexahydro deriv. Dihydroabikoviromycin