2H-Oxocin-2-methanol, 7-bromo-8-ethyl-3,6,7,8-tetrahydro-.alpha.-2-penten-4-ynyl-, acetate, (E)-(.alpha.R,2R,7S,8R)- 2H-Oxocin-2-methanol, 7-bromo-8-ethyl-3,6,7,8-tetrahydro-.alpha.-2-penten-4-ynyl-, acetate, [2R-[2.alpha.[R*(E)],7.beta.,8.alpha.]]- 2H-Oxocin-2-methanol, 7-bromo-8-ethyl-3,6,7,8-tetrahydro-.alpha.-2-penten-4-ynyl-, acetate, [2R-[2.alpha.[R*-(E)],7.beta.,8.alpha.]]- 3442-58-8 LAURENCIN NSC122763