Methylprednisolone EP Impurity J Catalogue G112650 CAS 53-36-1 M.W 416.51 M.F C24H32O6 Specifications FAQs 2-((6S,8S,9S,10R,11S,13S,14S,17R)-11,17-dihydroxy-6,10,13-trimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)-2-oxoethyl acetate