1-Piperazineacetic acid, 4-(dithiocarboxy)-, 1-ethyl ester, compd. with ethyl 1-piperazineacetate (1:1) 29140-80-5 4-(Dithiocarboxy)-1-piperazineacetic acid 1-ethyl ester compd. with ethyl 1-piperazineacetate