1-pyrrolidinecarboxylic acid, 2-[(E)-2-(chlorosulfonyl)ethenyl]-, 1,1-dimethylethyl ester InChI=1/C11H18ClNO4S/c1-11(2,3)17-10(14)13-7-4-5-9(13)6-8-18(12,15)16/h6,8-9H,4-5,7H2,1-3H3/b8-6 tert-butyl 2-[(E)-2-(chlorosulfonyl)vinyl]pyrrolidine-1-carboxylate