111264-35-8
(S,E)-3-ethyl-3-(2-nitrovinyl)tetrahydro-2H-pyran-2-one
→
111154-20-2
(3S)-3-ethyl-5-hydroxy-3-(3-hydroxypropyl)dihydrofuran-2(3H)-one
4880-88-0
(-)-象牙(洪达木)酮宁