| http://www.w3.org/ns/prov#value | - Irradiating the modified substrate with ultraviolet light removes the carbamate protecting group from the compound to form a unprotected o-nitrosobenzyl analog represented by the formula: ##STR2## wherein R3 is NO2 or H and R2 is a linear linking group having a distal end that is covalently bonded to the substrate.
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