[C:1](Cl)([C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:21][C:22]1([CH3:34])[S:26][C@@H:25]2[C@H:27]([NH2:30])[C:28](=[O:29])[N:24]2[C@H:23]1[C:31](O)=O.C([N:37](CC)CC)C>C(Cl)(Cl)Cl>[C:2]1([C:1]([NH:30][CH:27]2[C:28](=[O:29])[N:24]3[CH:23]([C:31]#[N:37])[C:22]([CH3:34])([CH3:21])[S:26][C@H:25]23)([C:14]2[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=2)[C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1Tritylchloride (61.2 g., 0.22 mole) is added to a mixture of 6-aminopenicillanic acid (43.3 g., 0.20 mole) and triethylamine (5.56 ml.)in chloroform (300 ml.) at about 5° C. The somewhat exothermic reaction is stirred and allowed to rise gradually to room temperature. It is stirred at room temperature for three days. Evaporation of the reactionmixture affords the title product which is used without purification.
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