[CH3:1][N:2]([CH3:28])[CH2:3][C:4]([NH:6][C@H:7]([C:10]([NH:12][C@H:13]([C:16]([N:18](CNC(=O)C)[CH2:19][C:20]([OH:22])=[O:21])=[O:17])[CH2:14][SH:15])=[O:11])[CH2:8][OH:9])=[O:5].O>C(O)(=O)C>[CH3:1][N:2]([CH3:28])[CH2:3][C:4]([NH:6][C@H:7]([C:10]([NH:12][C@H:13]([C:16]([NH:18][CH2:19][C:20]([OH:22])=[O:21])=[O:17])[CH2:14][SH:15])=[O:11])[CH2:8][OH:9])=[O:5]A solution of dimethylglycylserinylcysteinyl(Acetomidomethyl)glycine (RP414) (50 mg) and mercuric acetate (75 mg) in 30% acetic acid (2 mL) was stirred at room temperature for 3 h. Distilled water (2 mL) was added and H2S gas was slowly bubbled through the solution for 3 min causing a black precipitate (mercury sulfide). The solution was filtered through a 0.2 micron filter diluted with a further 2 mL of distilled water and lyophilised.
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