[CH3:1][NH:2][CH2:3][C:4]([OH:6])=O.C1N(CC(O)=O)CCN(CC(O)=O)CCN(CC(O)=O)CCN(CC(O)=O)C1.[OH:35][C:36]([CH2:38][CH2:39][CH2:40][CH2:41][C@H:42]1[C@@H:50]2[C@@H:45]([NH:46][C:47]([NH:49]2)=[O:48])[CH2:44][S:43]1)=[O:37].N[C@@H](C(O)=O)C>CN(C=O)C.C(N(CC)CC)C>[CH3:1][NH:2][CH2:3][C:4]([CH:38]([CH2:39][CH2:40][CH2:41][C@H:42]1[C@@H:50]2[C@@H:45]([NH:46][C:47]([NH:49]2)=[O:48])[CH2:44][S:43]1)[C:36](=[O:35])[OH:37])=[O:6]The N-methyl glycine-linked DOTA-biotin conjugate was prepared by an analogous method to that used to prepare D-alanine-linked DOTA-biotin conjugates. N-methyl-glycine (trivial name sarcosine, available from Sigma Chemical Co.) was condensed with biotin-NHS ester in DMF and triethylamine to obtain N-methyl glycyl-biotin. N-methyl-glycyl biotin was then activated with EDCI and NHS. The resultant NHS ester was not isolated and was condensed in situ with DOTA-aniline and excess pyridine. The reaction solution was heated at 60° C. for 10 minutes and then evaporated. The residue was purified by preparative HPLC to give [(N-methyl-N-biotinyl)-N-glycyl]-aminobenzyl-DOTA.
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