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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Top Curr Chem (Cham). 2015 Dec 11;374(1):1. doi: 10.1007/s41061-015-0002-2

Scheme 2.

Scheme 2

a Strategy based on photoactivation of the precursor to generate a highly reactive and unstable species. b Strategy based the removal of a photo-protecting group