Abstract: An agent composition for the therapy or prevention of the injury of an organ or a tissue containing a phenylthiazole derivative expressed by the following formula (1): ##STR1## (R.sub.1 is a C.sub.1 -C.sub.18 alkoxy group or a cyclic amino group; R.sub.2 is a cyano group or a nitro group; R.sub.3 is a hydrogen atom or a C.sub.1 -C.sub.4 alkyl group), and/or its salt as an active ingredient.

Abstract: A calcium-magnesium carbonate composite consisting of particles of calcium carbonate and magnesium carbonate hydroxide and having excellent properties, for example, as a pigment for paper coating is proposed, which is a uniform blend of:(A) particles of calcium carbonate having a crystalline structure of aragonite with a columnar particle configuration having a length in the range from 0.5 to 3 .mu.m and a diameter in the range from 0.1 to 0.3 pm with an aspect ratio in the range from 5 to 15; and(B) particles of magnesium carbonate hydroxide having a plate-like particle configuration with a particle diameter in the range from 2 to 7 .mu.m and a thickness in the range from 0.05 to 0.5 .mu.m,the blend having an overall specific surface area in the range from 15 to 30 m.sup.2 /g and the weight proportion of the particles of calcium carbonate to the particles of magnesium carbonate hydroxide being in the range from 95:5 to 50:50 calculated as the respective hydroxides.