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美国药典标准品#1667381,噻吗洛尔相关化合物A,Timolol Related Compound A (20 mg) ((R)-1-(tert-Butylamino)-3-(4-morpholino-1,2,5-thiadiazol-3-yloxy)propan-2-ol maleate),CAS#26839-77-0