Acetic acid, 2,2',2''-[25,26,27-trihydroxy-7,15,23- trimethyl-3,11,19-triazatetracyclo[19.3.1.1(5,9).1(13,17)] heptacos-1(24),5,7,9(27),13(26),14,16,21(25),22-nonaen- 3,11,19-triyl]tris-, trimethyl ester NSC700323