[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([C:9]2[NH:10][C:11]([N+:15]([O-])=O)=[C:12]([CH3:14])[N:13]=2)=[CH:5][CH:4]=1.[C:18](OC(=O)C)(=[O:20])[CH3:19].[H][H]>CC(O)=O.[Pt]>[C:18]([NH:15][C:11]1[NH:10][C:9]([C:6]2[CH:7]=[CH:8][C:3]([O:2][CH3:1])=[CH:4][CH:5]=2)=[N:13][C:12]=1[CH3:14])(=[O:20])[CH3:19]A solution of 41 (3.5 g, 0.015 mole) dissolved in glacial HOAc (35 ml)--acetic anhydride (105 ml) was hydrogenated at 50 psi over 5% platinum on charcoal catalyst (0.75 g) until uptake of hydrogen was complete. Catalyst was filtered off and the filtrate was evaporated to dryness under reduced pressure. The residue was dissolved in H2O (50 ml) and heated on a steam bath for 1 hour. The cooled solution was washed with ether (4×10 ml) and then evaporated to dryness in vacuo. Recrystallization of the residue from CHCl3 gave 3.07 g (84%) of 42 in two crops; m.p. 202°-204° C.
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