En­do sues Zy­dus in patent bat­tle over meth­ods of pu­ri­fy­ing gener­ic ver­sion of re­called smok­ing ces­sa­tion drug Chan­tix

En­do In­ter­na­tion­al, which lost a patent bat­tle last year over its va­so­pressin in­jec­tion Va­sostrict, is back in court — this time su­ing Zy­dus Phar­ma­ceu­ti­cals for patent …

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