上游原料
2-Hydroxy-6-methoxybenzaldehydeethyl 5-bromopentanoateethyl 5-(2-formyl-3-methoxyphenoxy)pentanoate5-(2-formyl-3-methoxyphenoxy)pentanoic acidethyl 5-bromopentanoate2-(benzyloxy)-6-hydroxybenzaldehydeethyl 5-[3-(benzyloxy)-2-formylphenoxy]pentanoate5-[3-(benzyloxy)-2-formylphenoxy]pentanoic acidethyl 5-bromopentanoatemethyl 3-formyl-2,4-dihydroxybenzoatemethyl 4-[(5-ethoxy-5-oxopentyl)oxy]-3-formyl-2-hydroxybenzoate4-(4-carboxybutoxy)-3-formyl-2-hydroxybenzoic acid
