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In an aspect, the present disclosure relates to an industrially scalable process for manufacturing Z endoxifen, comprising the steps of a reacting a mixture of E endoxifen and Z endoxifen, compounds of Formula III, to 6N HCL 1 1 to 1 5 wt wt in EtOAc 1 1 to 1 20 wt wt, b neutralizing with 8N NaOH 1 1 to 1 20 wt wt; c washing one or more times with EtOAc 1 1 to 1 10 wt wt; d extracting with 20 NaCl 1 1 to 1 5 wt wt; e reacting with activated carbon 1 0 <a href=https://vardenafil.top>cialis viagra o levitra</a>