124857-59-6 Benzoic acid, 4-hydroxy-, (3,10-dihydro-4,9-dihydroxy-2,6,7,11-tetramethoxy-3,10-dioxo-1,12-perylenediyl)bis(1-methyl-2,1-ethanediyl) ester Calphostin I Ucn 1028 I