Rupatadine Fumarate: 8-?chloro-?6,?11-?dihydro-?11-?[1-?[(5-?methyl-?3-?pyridinyl)?methyl]?-?4-?piperidinylidene]5H-?Benzo[5,?6]?cyclohepta[1,?2-?b]?pyridine? fumarate (1:1).