80-40-0 Benzenesulfonic acid, 4-methyl-, ethyl ester Ethyl p-TS Ethyl p-methylbenzenesulfonate Ethyl p-toluenesulfonate Ethyl p-tosylate Ethyl tosylate NSC8887 WLN: 2OSWR D1 p-Toluenesulfonic acid, ethyl ester p-Toluolsulfonsaeure aethyl ester