((1-methyl)ethoxycarbonyloxy)-ethyl 7-(2-(2-amino-4-thiazole)-2-methoxyaminoacetamido)-3-(2-propenyl)-3-cephem-4-carboxylate, (6R-(2(S*)),6alpha,7beta(Z)) isomer
((1-methyl)ethoxycarbonyloxy)-ethyl 7-(2-(2-amino-4-thiazole)-2-methoxyaminoacetamido)-3-(2-propenyl)-3-cephem-4-carboxylate, (6r-(2(s*)),6alpha,7beta(z)) isomer