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By A. ALBINI, E. FASINI

Offers the elemental parts of the technology, & serves as a good advent to this rising box of photochemistry. targeted experimental stipulations for photostability experiences are given, in addition to a dialogue of the lately carried out ICH instructions for drug photostability.

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L. Costanzo, Coord. Chem. Rev. 1993, 125, 115. 21. D. Budac and P. Wan,J. Photochem. , 1992,67, 135. 22. K. Reszka and C. F. Chignell, Photochem. , 1983,38,281. 23. F. Bosca, M. A. Miranda, L. Van0 and F. Vargas, J. Photochem. , 1990,54, 131. 24. J. V. J. Gomez-Lechon, M. A. Miranda and I. M. Morrea, Photochem. , 1987,46, 991. 25. J. V. Castell, M. J. Gomez-Lechon, M. A. Miranda and I. M. Morera, J. Photochem. Photobiol. , 1992, 13, 71. 26. Monti, S. Sortino, G. De Guidi and G. Marconi, J. Chem.

Aromatisation of the heterocyclic ring and reduction of the nitro to the nitroso group result. In the presence of oxygen the nitroso fbnction is in turn re-oxidised (see Scheme 35). 1269127 vo2 2-NO2 3-NO2 P (119) Scheme 35 O 2 22 Drugs: Photochemistry and Photostability Other 4-(2-nitrophenyl)dihydropyridines such as hrnidipine (1 18b, R, R’= Et, 2tetrahydrofiuylmethyl)128react similarly, and the same holds for 4-(3-nitrophenyl) derivatives such as nitrendipine (121a, R, R’=Me, Et),129 nimodipine (121b, R, R’=iso-propyl, 2methoxyethyltetrahydrohrylmethyl)l30 and nicardipine [121c, R=Me, R’=(N-methyl-Nbenzyl)-2-aminoethyl].

1987,46, 991. 25. J. V. Castell, M. J. Gomez-Lechon, M. A. Miranda and I. M. Morera, J. Photochem. Photobiol. , 1992, 13, 71. 26. Monti, S. Sortino, G. De Guidi and G. Marconi, J. Chem. , 1997, 93,2269. 27. F. Bosca, M. A. Miranda, G. Carganico and D. Mauleon, Photochem.

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