CAS 5550-75-4 appears in our catalog under these names: Dihydro Ergotamine Mesylate EP Impurity D, 2’-Epi-9,10-dihydroergotamine, >95% (HPLC), 2'-Epi-9,10-dihydroergotamine, >95% (HPLC), 2’-Epidihydroergotamine. Offered by: Chemat Brand, TRC, Biosynth. Available pack sizes: on request, 10mg, 2,5mg, 25mg, 1000ug, 500ug, 2000ug, 5000ug.