(4-methyl-morpholine-3,5-diyl)-di-acetic acid diethyl ester

3,7-dichloro-5-oxa-nonanedioic acid diethyl ester

5-oxa-nona-2,7-dienedioic acid

1,3-丙酮二羧酸

2-(2,2-dimethoxyethoxy)-1,1-dimethoxyethane