EC21 Selling Leads Catalogs - o phthalic acid http://www.ec21.com/offers/o phthalic acid.html Sell 4-Amino-o-phthalic Acid [4APA]http://www.ec21.com/offer_detail/Sell_4_Amino_o_phthalic--8079491.htmlMail Address: ruby(at)weltonchem(dot)com; Contacter: Miss.ruby from Changzhou Welton Chemical Co.,Ltd. Specification: C20090615