Antianginal pharmaceutical compositions containing as the active ingredient a compound of the formula IMAGE wherein R1 is hydrogen, unsubstituted or hydroxyl-substituted alkyl of 1 to 4 carbon atoms; allyl; or unsubstituted or halo-, methyl-, methoxy- or trifluoromethyl-substituted benzyl; and X is oxygen or sulfur; or a non-toxic, pharmaceutically acceptable acid addition salt thereof; and methods of treating angina pectoris therewith.
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