Gravar-mail: Diaqua­bis­(2-hy­droxy­benzoato-κO (1))bis­(nicotinamide-κN (1))cadmium–diaqua­bis­(2-hy­droxy­benzoato-κ(2) O (1),O (1′))(nico­tin­amide-κN)cadmium–water (1/2/4)