(5'alpha,10alpha)-9,10-Dihydro-12'-hydroxy-2'-methyl-5'-(2-methylpropyl)ergotaman-3',6',18-trione 65222-90-4 Ergotaman-3',6',18-trione, 9,10-dihydro-12'-hydroxy-2'-methyl-5'-(2-methylpropyl)-, (5'alpha,10alpha)-, monomethanesulfonate (salt)