Fish & Richardson P.C.
Caged membrane-permeant inositol phosphates
 Caged acyloxyalkyl esters of phosphate-containing inositol phosphates which are capable of permeating cell membranes. The second messengers are protected (caged) at the 6-hydroxyl, with a photolabile group. Once inside the cell, the ester derivatives undergo enzymatic conversion to remove the acyloxyalkyl ester groups. The resulting caged compound remains biologically inactive until exposed to ultraviolet (UV) light. Upon UV light exposure, the active form of the second messenger is released within the cell. 
The Regents of the University of California
C A C C C C A Y
C07F A61K C07F C07F C07H C07F A61K Y02P
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Wenhong Roger Y.
Li Tsien