Fig. 3.

IM separation and CCS measurements for isomers betamethasone and dexamethasone as (A) [M + Li]⁺, (B) [M + K]⁺, and (C) [M + Rb]⁺; and for cortisone and prednisolone as (D) [M + Li]⁺, (E) [M + K]⁺, and (F) [M + Rb]⁺.