(Z)-3-(5-Ethyl-4-hydroxy-3-methoxy-1-naphthalenyl)-2-methyl-2-propenoic acid 131420-84-3 2-Propenoic acid, 3-(5-ethyl-4-hydroxy-3-methoxy-1-naphthalenyl)-2-methyl-, (Z)- 3-(4-Hydroxy-5-ethyl-3-methoxy-1-naphthalenyl)-2-methyl-2-propenoic acid 3-(5-Ethyl-4-hydroxy-3-methoxy-1-naphthalenyl)-2-methyl-2-propenoic acid DA-E 5090 DA-E5090