label: dimethyl 6-(1,2-bis(methoxycarbonyl)-2-(triphenyl-lambda5-phosphanylidene)ethylideneamino)-2-methylsulfanyl-3,4-pyridinedicarboxylate
label_lc: dimethyl 6-(1,2-bis(methoxycarbonyl)-2-(triphenyl-lambda5-phosphanylidene)ethylideneamino)-2-methylsulfanyl-3,4-pyridinedicarboxylate