Glycerol formal CRS–甘油甲醛标准品

"This reference standard will be officially withdrawn from monograph 04/2015:2233 on 01/04/2022 and replaced by Marbofloxacin for impuriyt mixture. The reference will remain visible in the catalogue until 01/04/2023.Due to a shortage in Y0000820 please Prepare reference solution(b) as follows: Reference solution (b). Dissolve the contents of a vial of marbofloxacin impurity mixture CRS Y0002317 (containing impurities A, B, C, D and E) in 1 mL of the test solution. ; Batch 1 is valid until 1 October 2022"