4-(5,7-dimethyl-4,6-dioxo-[1,2]oxazolo[3,4-d]pyrimidin-3-yl)butanoic acid

benzyl 5-chloro-5-oxopentanoate

decyl 5-chloro-5-oxopentanoate

1-O-hexyl 5-O-(4-hydroxybutyl) pentanedioate

1-O-hexyl 5-O-(6-hydroxyhexyl) pentanedioate