Synthesis, characterization and catalytic properties of diorganotin derivatives. Crystal and molecular structure of the first complex of 2-(2-methyl-3-nitroanilino) benzoic acid of 1,2: 3,4-di-l2-2-(2-methyl-3-nitroanilino)benzoato-O,O-1,3-bis-2-(2-methyl-3-nitroanilino)-benzoato-O-1,2,4:2,3,4-di-l3-oxo-tetrakis[di-methyltin(IV)] (vol 693, pg 3587, 2008)