(R*,R*)-2-<1-hydroxy-3-phenylprop-2-ynyl>butan-4-olide
(R*,S*)-2-<1-hydroxy-3-phenylprop-2-ynyl>butan-4-olide
3-(6-bromo-5-methoxy-2-nitro-2,4-cyclohexadienyl)-1-oxacyclopentan-2-one
3-(5-methyl-2-nitrophenyl)oxacyclopentan-2-one
2-(((p-nitrophenyl)sulfonyl)oxy)butyrolactone