Ácido carbónico
HETATM 1 C 1 -0.265 0.317 0.015 HETATM 2 O 2 -0.265 1.538 0.015 HETATM 3 O 3 0.913 -0.362 0.015 HETATM 4 O 4 -1.443 -0.362 0.015 HETATM 5 H 5 0.737 -1.306 0.015 HETATM 6 H 6 -1.267 -1.306 0.015 CONECT 1 2 3 4 CONECT 2 1 CONECT 3 1 5 CONECT 4 1 6 CONECT 5 3 CONECT 6 4 END