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penicillin X Penicillin III 4-Hydroxybenzylpenicillin 6α-[(4-Hydroxyphenyl)acetylamino]penicillanic acid (2S,5β)-6α-[[(4-Hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2β-carboxylic acid 4-Thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, 6-[[2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-, (2S,5R,6R)- Benzathine Benzylpenicillin EP Impurity GQ: What is Benzathine Benzylpenicillin EP Impurity G Q: What is the CAS Number of Benzathine Benzylpenicillin EP Impurity G