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美国药典标准品#1700512,色氨酸相关化合物A,Tryptophan Related Compound A (15 mg) ((2S,2’S)-3,3′-[Ethane-1,1-diylbis(1H-indole-1,3-diyl)]bis(2-aminopropanoic acid)),CAS#132685-02-0