2-Butyne-1,4-diol, bis(p-chlorophenylcarbamate) 2-Butynylene 1,4-bis(N-4-chlorophenylcarbamate) 21840-68-6 Carbanilic acid, p-chloro-, 2-butynylene ester NSC191890 WLN: GR DMVO2UU2OVMR DG