ulobetasol ulobetasol ulobetasol (inn) or halobetasol (usan) is a corticosteroid used to treat psoriasis. it is a class i corticosteroid under the us classification and a group iii corticosteroid under international classification, the most potent group of such drugs. ulobetasolclinical datatrade namesultravateother names(6s,8s,9s,10s,11s,13s,14s,16s,17r)-17-(2-chloroacetyl)-6,9-difluoro-11,17-dihydroxy-10,13,16-trimethyl-6,7,8,11,12,14,15,16-octahydrocyclopentaphenanthren-3-one, halobetasol (usan us)ahfs/drugs.comprofessional drug factsmedlineplusa601060atc coded07ac21 (who) d05ax55 (who) (combination with tazarotene)identifiers iupac name (6α,11β,16β)-21-chloro-6,9-difluoro-11,17-dihydroxy-16-methylpregna-1,4-diene-3,20-dione cas number98651-66-2 npubchem cid5311167chemspider4470691 yunii9p6159hm7tkeggd08660 ychemblchembl1201360 ncomptox dashboard (epa)dtxsid60243759 chemical and physical dataformulac22h27clf2o4molar mass428.90 g·mol−13d model (jsmol)interactive image smiles clcc(=o)3(o)2(c(o)4(f)/1(\c(=c/c(=o)\c=c\1)(f)c42c3c)c)c inchi inchi=1s/c22h27clf2o4/c1-11-6-13-14-8-16(24)15-7-12(26)4-5-19(15,2)21(14,25)17(27)9-20(13,3)22(11,29)18(28)10-23/h4-5,7,11,13-14,16-17,27,29h,6,8-10h2,1-3h3/t11-,13-,14-,16-,17-,19-,20-,21-,22-/m0/s1 ykey:lehfpxvypmwyqd-xhijkxotsa-n y ny (what is this?) (verify) ulobetasol propionate is usually supplied as a 0.05% topical cream. ulobetasol is the strongest topical steroid available. it is also sold with tazarotene with 0.01% halobetasol and 0.045% tazarotene as a lotion branded as duobrii (bausch health). it is available as a generic medication.