. "4-(5-{4-[(S)-1-(5-Benzyloxy-2,2,4,6,7-pentamethyl-2,3-dihydro-benzofuran-3-ylmethyl)-pyrrolidin-2-ylmethoxy]-benzyl}-2,4-dioxo-thiazolidin-3-yl)-2-hydroxy-4-oxo-butyric acid anion" . "19a maleate" . . . . .