Xanthines for identifying CFTR--binding compounds useful for activating chloride conductance in animal cells

摘要

The present invention provides novel compounds and pharmaceutical compositions comprising such compounds useful for treating cystic fibrosis cells, wherein such compounds have the formula ##STR1## wherein (a) R.sub.1 and R.sub.3 are methyl, R.sub.7 is ethyl or cyclopropylmethyl, and R.sub.8 is cyclohexyl; (b) R.sub.1 and R.sub.3 are allyl, R.sub.7 is hydrogen and R.sub.8 is cyclohexyl, cyclohexylmethyl, or cycloheptyl; (c) R.sub.1 is allyl and R.sub.3 is methyl, R.sub.7 is hydrogen, and R.sub.8 is cyclohexyl; or (d) R.sub.1 is methyl, R.sub.3 is allyl, R.sub.7 is cyclopropylmethyl or ethyl, and R.sub.8 is cyclohexyl.