(S-(Z))-5-Ethylidene-2-hydroxy-2-(hydroxymethyl)-3-methylenehexanedioic acid 511-57-9 Hexanedioic acid, 5-ethylidene-2-hydroxy-2-(hydroxymethyl)-3-methylene- Hexanedioic acid, 5-ethylidene-2-hydroxy-2-(hydroxymethyl)-3-methylene-, (S-(Z))- Riddelic acid Riddellic acid