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ESI-MS/MS spectra (25 V) obtained from isomeric free sterol (FS) standards as [FS-H2O+H]+; (A) desmosterol and 7-deyhdrosterol with m/z 367; (B) 24-methylenecholesterol and brassicasterol with m/z 381; (C) spinasterol and stigmasterol with m/z 395; and (D) cholestanol and coprostanol with m/z 371.
