1,5-Cyclononadiene-1,2,5,6-tetracarboxylic acid, 8-ethyl-3-propyl-, tetrasodium salt 25198-75-8 8-Ethyl-3-propyl-1,5-cyclononadiene-1,2,5,6-tetracarboxylic acid tetrasodium salt Tetrasodium byssochlamic acid