“…So far, fourteen natural alkaloids have been reported to possess inhibitory potentials towards IKKβ (Figure 13-15), including berberine (43), vinpocetine (44), cryptopleurin (45), matrine (46), tetrandrine (47), piperlongumine (48), daphnipaxianine A (49), pipernigamides E-G (50-52), tulipiferamide A (53), herbimycin A (54), himalesine (55), and ellipticine (56) [115,[161][162][163][164][165][166][167][168][169]. Among them, himalensine (55, Figure 14), isolated from Daphniphyllum himalense, possesses an unprecedented 6/5/6/7/5/6 skeleton, and its proposed biosynthetic pathway was discussed [164].…”