2-methyl-5-[(tetrahydro-2H-pyran-2-yl)-oxy]-3-pentyn-2-ol

4-甲基-2-丙炔-1,4-二醇

diethyl 2-(2-methylprop-2-enyl)propanedioate

4-methyl-4-nitropentanoic acid

ethyl 4-methyl-4-nitro-pentanoate