Trispropionic acid methylstannylidynetris(thio-2,1-ethanediyl) ester

4-methyl-9-oxo-4-[[2-(propionyloxy)ethyl]thio]-8-oxa-3,5-dithia-4-stannaundecyl propionate

4-Methyl-9-oxo-4-[[2-(1-oxopropoxy)ethyl]thio]-8-oxa-3,5-dithia-4-stannaundecan-1-ol propanoate