[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][N:9]2[C:13]3[CH:14]([CH2:19][C:20]([O:22]CC)=[O:21])[CH2:15][CH2:16][CH2:17][CH2:18][C:12]=3[N:11]=[C:10]2[C:25]([CH3:28])([CH3:27])[CH3:26])=[CH:4][CH:3]=1.[OH-].[Na+]>CO>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:8][N:9]2[C:13]3[CH:14]([CH2:19][C:20]([OH:22])=[O:21])[CH2:15][CH2:16][CH2:17][CH2:18][C:12]=3[N:11]=[C:10]2[C:25]([CH3:28])([CH3:27])[CH3:26])=[CH:6][CH:7]=1Intermediate 16 (22 mg) was dissolved in Methanol (1 ml) and treated with sodium hydroxide, 2M aq. (1 mL). The RM was left in solution for 1 hour. The residue was purified by MDAP (Method A). The desired fractions were combined and concentrated under nitrogen blowdown to give the title compound (17 mg). LC/MS MH+ 375, Rt 1.72 min (5 minute run).
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