申请人:Intervet Inc.
                            
                            
                                公开号:US20210107874A1
                            
                            
                                公开(公告)日:2021-04-15
                            
                            The present invention is directed to a salt of a compound of formula (I), R
1
is halogen or methyl; X is methyl, OR
2
, or SR
2
; Y
1
, Y
2
is CR
3
or N, and one of Y
1
, Y
2
is N and one of Y
1
, Y
2
is CR
3
; R
2
is methyl or ethyl; R
3
is hydrogen or methyl, wherein the salt is chosen from the group 10 consisting of malate salt, citrate salt, tartrate salt, oxalate salt, fumarate salt, lactate salt, glucoronate salt, oxoglucoronate salt, ethanesulfonate salt, and succinate salt. The present invention is further related to a pharmaceutical formulation comprising the salt of the invention wherein the base compound is present in an amount of 2-30% (w/v) and having a pH value of at least 3.7 and to methods of treatment using the salt of the invention.