An acid addition salt of a compound of Formula I, wherein R2 represents C1-6 alkyl (optionally substituted and/or terminated by one or more substituents selected from -OH, halo, cyano, nitro and aryl) or aryl, wherein each aryl and aryloxy group, unless otherwise specified, is optionally substituted.
Formula I的化合物的酸加盐,其中R2代表C1-6烷基(可选择地被一个或多个取代基选自-OH,卤素,
氰基,硝基和芳基取代和/或终止)或芳基,其中每个芳基和芳氧基组,除非另有规定,可选择地被取代。