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美国药典标准品#1249417,艾司西肽普兰相关化合物A,Escitalopram Related Compound A (10 mg) ((S)-4-[4-dimethylamino-1-(4-fluoropheny)-1-hydroxy-1-butyl]-3-hydroxymethylbenzonitrile hemi(+)-di-toluoyltartrate),CAS#128173-53-5