23846-85-7 4,4a-Epoxy-5-ethylidene-2,3,4,4a-tetrahydro-5H-1-pyridine 7-Ethylidene-1a,2,3,7-tetrahydrocyclopent(b)oxireno(c)pyridine Antibiotic SF-973 A Cyclopent(b)oxireno(c)pyridine, 7-ethylidene-1a,2,3,7-tetrahydro-