603804 Process for the preparation of a Compound of formula I in the form of a single stereoisomer in crystalline form, comprising deprotecting the amine group in a Compound of formula IIa or in a mixture of a compound of formula IIa With a compound of formula IIb and isolating a Compound of formula I from the reaction mixture； Compounds and salts of Compounds of formula I in crystalline form； pharmaceutical compositions comprising such salts； processes for the preparation of intermediates and intermediates in a process for the preparation of a Compound of formula I. some of the exemplified compounds of formula I include: 14-O-{ [(1R,2R,4R)-4-amino-2-hydroxy-cyclohexylsulfanyl]-acetyl} -mutilin acetate in crystalline Form A； 14-O-{ [(1R,2R,4R)-4-amino-2-hydroxy-cyclohexylsulfanyl]-acetyl} -mutilin acetate in crystalline Form B 14-O-{ [(1R,2R,4R)-4-amino-2-hydroxy-cyclohexylsulfanyl]-acetyl} -mutilin L-Iactate in crystalline Form 1, and 14-O-{ [(1R,2R,4R)-4-amino-2-hydroxy-cyclohexylsulfanyl]-acetyl} &ndash；mutilin hydrogenmaleate in crystalline Form 1.
