Structure-activity relationships in a series of xanthine derivatives with antibronchoconstrictory and bronchodilatory activities
M Merlos1, L Gomez1, ML Vericat1, J Bartroli2, J Garcia-Rafanell1 and J Form
European Journal of Medicinal Chemistry
Volume 25, Issue 8, October 1990, Pages 653-658
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http://dx.doi.org/10.1016/0223-5234(90)90130-U 