It is provided a compound of formula (I')； wherein R 5 is selected from the group consisting of -H, -OM, -COOM, -NH 2 , - SO 3 M, (C 1 -C 4 )alkyl, and halogen； and A is a radical having at least 3 C atoms selected from the group consisting of: i) a radical of formula (i) wherein R 7 is selected from the group consisting of -OM, and -COOM, and n is 0, 1 or 2； and ii) a radical of formula (ii) or of formula (iii) wherein R 8 is selected from the group consisting of -H, (C 1 -C 4 )alkyl； and wherein M is independently selected from the group consisting of H, an alkaly metal, and NH 4 + . It is also provided a process for the preparation thereof, a composition comprising it, and its use for correcting deficiencies of metals in plants.
