[CH3:1][CH:2]([CH2:8][CH3:9])[CH2:3][CH2:4][C:5](O)=[O:6].S(Cl)([Cl:12])=O>>[CH3:1][CH:2]([CH2:8][CH3:9])[CH2:3][CH2:4][C:5]([Cl:12])=[O:6]The acid from step A2 is converted into the acid chloride by interaction with thionyl chloride according to a standard method. After removal of the excess of thionyl chloride, the residual acid chloride is used in step C2 without further purification.
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