2-Hydroxy-5-aminobenzoate derivate → 4-Amino-6-oxohepta-2,4-dienedioate derivative<br>2-Hydroxy-5-nitrobenzoate derivative → 4-Nitro-6-oxohepta-2,4-dienedioate derivative<br>Hydroxy-2-naphthoate → 6-Carboxy-2,4-dien-2-oxoproponate benzyl derivative
