New [f]-fused theophyllines: a simple one-step synthesis of the pyrimido[2,1-f]purine system via 8-azidopurines

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• Chemieliva Pharmaceutical Co., Ltd.

  website:http://www.chemieliva.com

  Contact:+86-23-67770219

  Address:99 Longhua Road, Yubei District, 401147, Chongqing, China Email: sales@chemieliva.com Tel:0086-23-67770219 Fax: 0086-23-67770220 Attn: Andy Huang

• Liaoning Yufeng Chemical Co.,Ltd.

  Contact:86-0419-3418888

  Address:The metallurgical industrial zone,shoushan town, Liaoyang, Liaoning, China

• Zibo Xiaoguang Chemical Material Co., Ltd

  Contact:15954099116

  Address:Boshan Development Zone

• Ring Specialty Chemicals Inc.

  website:http://www.ringchemicals.com/

  Contact:+1-416-493-6870

  Address:Toronto, Canada

• Esuccess Material Limited

  Contact:852-29282288

  Address:HONGKONG