Migranal (dihydroergotamine mesylate spray) ® is ergotamine hydrogenated in the 9,10 position as the mesylate salt. Migranal (dihydroergotamine mesylate spray) ® is known chemically as ergotaman-3', 6', 18-trione, 9,10-dihydro-12'-hydroxy-2'-methyl-5'- (phenylmethyl)-, (5'?)-, monomethanesulfonate. Its molecular weight is 679.80 and its empirical formula is C33H37N5O5•CH4O3S.

D.H.E. 45 (dihydroergotamine) ® is ergotamine hydrogenated in the 9, 10 position as the mesylate salt. D.H.E. 45 (dihydroergotamine) ® is known chemically as ergotaman-3',6',18-trione,9,10-dihydro-12'-hydroxy-2'-methyl-5'- (phenylmethyl) (5'a)-, monomethanesulfonate. Its molecular weight is 679. 80 and its empirical formula is C13H37N5O5 · CH4O3S. Its chemical structure is: