1,4-Etheno-2,3-benzodioxin-1,4-dipropanoic acid sodium salt 1,4-Etheno-2,3-benzodioxin-1,4-dipropanoic acid, disodium salt 3,3'-(1,4-Naphthylidene)dipropionate endoperoxide 3,3'-(1,4-Naphthylidene)diproprionate 97860-59-8 Disodium 3,3'-(1,4-naphthylidene)dipropionate endoperoxide Endoperoxide of 3,3'-(1,4-naphthylidene)dipropionate disodium salt NDPO2