Construction of pyrimido[5,4-e]-as-triazine, purine, v-triazolo-[4,5-d]pyrimidine and pyrazolo[3,4-d]pyrimidine ring systems from 5-arylazo-6-arylidenehydrazino-1,3-dimethyluracils

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• taicang liyuan chemical co,.ltd

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• Changzhou BaoKang Pharmaceutical & Chemical Co., Ltd

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• Hefei TNJ chemical industry co.,ltd

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  Address:B911 Xincheng Business Center, Qianshan Road, Hefei Anhui China

• nanjing suru chemical co.ltd

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• Changsha Easchem Co.,Limited

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  Address:2/F-4/Bld Colorful Palace, No.605 Changsha Ave, Yuhua Area Changsha Hunan China.