A highly selective, cell-permeable, and reversible PKC inhibitor (Ki = 14 nM); acts as a competitive inhibitor for the ATP binding site of PKC and shows high selectivity for PKCα-, β1-, β2-, γ-, δ-, and ε-isozymes; inhibits GSK3 in primary adipocyte lysates (IC50 = 360 nM) and in GSK3β immunoprecipitates derived from rat epididymal adipocytes (IC50 = 170 nM); competitively antagonizes the 5-HT3 receptor with a Ki value of 61 nM.