4-Butyl-9-oxo-4-((2-(propionyloxy)ethyl)thio)-8-oxa-3,5-dithia-4-stannaundecyl propionate 67905-22-0 8-Oxa-3,5-dithia-4-stannaundecan-1-ol, 4-butyl-9-oxo-4-((2-(1-oxopropoxy)ethyl)thio)-, propanoate EINECS 267-641-8