Xanthine compounds

A compound selected from the group consisting of:

• xanthine compounds of the formula I:
• ##STR36## in which:
• R.sub.1 is selected from the group consisting of:
• hydrogen, and straight and branched alkyl having from 1 to 5 carbon atoms inclusive;
• R.sub.2 is selected from the group consisting of straight and branched hydrocarbon radicals having up to 6 carbon atoms inclusive, and these radicals having a double bond, phenyl, and benzyl;
• R.sub.3 is selected from the group consisting of hydrogen and alkyl, hydroxy alkyl and dihydroxyalkyl each having from 1 to 5 carbon atoms inclusive;
• R.sub.4 is selected from the group consisting of the group of the formula;
• ##STR37## in which Y is selected from the group consisting of hydrogen, halogen, alkyl and alkoxy each having from 1 to 5 carbon atoms inclusive, and hydroxyl;
• Z is selected from the group consisting of methylene and hydrocarbon radicals having from 2 to 5 carbon atoms and these hydrocarbon radicals substituted by hydroxyl, and
• A is selected from the group consisting of the amino residues of the formula:
• ##STR38## in which p is selected from the integers 2 and 3, ##STR39## in which q is selected from the integers 1 and 2, and
• X is selected from the group consisting of a double bond oxygen and ##STR40## in which R.sub.5 is selected from the group consisting of hydrogen and alkyl and alkoxy each having from 1 to 5 carbon atoms inclusive;
• and ##STR41## in which m is selected from the integers from 2 to 6;
• and
• R.sub.6 is selected from the group consisting of alkyls having from 1 to 5 carbon atoms inclusive;
• and
• physiologically tolerable acid addition salts thereof.