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| Other names | Phenethazinum, Phenethazine, Phenetazine; RP-3015, SC-1627, WY-1143 | 
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| ECHA InfoCard | 100.007.570 | 
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| Formula | C16H18N2S | 
| Molar mass | 270.39 g·mol−1 | 
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Fenethazine (INN; brand names Anergen, Contralergial, Ethysine, Etisine, Lisergan, Lysergan; former developmental codes RP-3015, SC-1627, and WY-1143; also known as phenethazine) is a first-generation antihistamine of the phenothiazine group. [1] Promethazine and chlorpromazine, were derived from fenethazine. [2] Fenethazine, in turn, was derived from phenbenzamine. [3]