“…Staurosporine (compound 27 , Table 3 ) was first named as AM-2282; later on, many of its analogs were synthesized. Another series of PKC inhibitors was isolated from the culture of Nocardiopsis species; among them are K-252a (IC 50 = 18–25 nM; compound 28 , Table 3 ), K-252b (IC 50 = 20 nM; compound 29 , Table 3 ) and K-252c (IC 50 = 2.45 µM) [ 68–70 ]. Furthermore, in 1992, RK-1409 (7-oxo Staurosporine; compound 30 , Table 3 ) was isolated from Streptomyces platensis , subsp.…”