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. Author manuscript; available in PMC: 2014 Jan 24.
Published in final edited form as: J Med Chem. 2010 Feb 11;53(3):1038–1047. doi: 10.1021/jm901029n

Scheme 2.

Scheme 2

The proposed degradation pathway of 2a-d in three pH values: pH 6.6, 7.0 and 7.4. Prodrug hydrolysis involves steps b and d whereas CPT formation is possible via pathways a, e, or f. However, results in this study demonstrate that only pathway e is responsible for CPT formation.