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L-Tryptophan (42)CAS RN:73-22-3;80206-30-0
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Shijiazhuang Rich Pharmaceutical Co,. Ltd.Telephone:86-311-84338609
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NEW DRAGON CO., LTDTelephone:+86-574-87716276 87721076 87703994
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Hangzhou Center Chemical Co.,Ltd.Telephone:+86-571-86820283
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Shenyang Yumu Industrial Co., Ltd.Telephone:+86-24-88552655 +86-24-88551819
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Quzhou J-LONG Chemical Co., Ltd.Telephone:+86-570-3044898
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Daming Changda Co.,Ltd.Telephone:+86-310-5102000
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Hangzhou Dingyanchem Co.,LtdTelephone:+86-571-87157530
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shanghai Xuxin Chemical Technology Co., LtdTelephone:+86-21-60890630
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Shanghai Sunwise Chemical Co, Ltd.Telephone:+86-21-60906580,60906575
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Daeyeon Chemicals Co.,LtdTelephone:+86-21-64478606