Propanedioic acid, 2-oxa-6,8-dithiaspiro[3.5]non-7-ylidene-, diethyl ester (9CI)
2-Oxa-6,8-dithiaspiro[3.5]nonane, propanedioic acid deriv.
Propanedioic acid, 2-(2-oxa-6,8-dithiaspiro[3.5]non-7-ylidene)-, 1,3-diethyl ester
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