2,4-Dimethoxy-5-(4-methoxy-3-sulfocinnamoyl)benzenesulfonic acid disodium salt 3,3'-(1-Oxopropenylene)-4,6,6'-trimethoxybis-benzenesulfonic acid disodium salt 30056-74-7 Benzenesulfonic acid, 2,4-dimethoxy-5-(4-methoxy-3-sulfocinnamoyl)-, disodium salt Sale sodico dell'acido 2',4,4'-trimetossicalcon-3,5'-disolfonico [Italian]