6,7-Dihydro O-Butyl-Rosuvastatin is a structurally defined process-related impurity characterized as (3R,5R)-t-Butyl 7-(4-(4-Fluorophenyl)-6-isopropyl-2-(N-methylmethylsulfonamido)pyrimidin-5-yl)-3,5-dihydroxyheptanoate. The impurity contains two stereogenic centers, tert-butyl ester and O-butyl moieties and typically originates from incomplete deprotection or inadvertent O-alkylation during esterification steps. Its presence can affect API purity and stability and therefore requires rigorous characterization and control. Recommended analytical approaches include reversed phase HPLC with UV and LC-MS detection for quantitation and monitoring, complemented by 1H/13C NMR and chiral HPLC for structural confirmation. Control strategy follows ICH impurity guidance via synthetic optimization, purification and validated assays.
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