1 85 4h m 1 70 1 50 6h m 0 86 3h t j 8 0 hz 3 4 aminophenethyl 8 3 noradamantyl 1 propylxanthine compound 2 0 32 g was obtained yield 37 according to the same manner as that described in example 1 except that 3 noradamantanecarboxylic acid 0 40 g 2 41 mmol and 5 6 diamino 3 4 benzyloxycarbonyl aminophenethyl 1 propyluracil 0 87 g 2 01 mmol obtained in reference example 2 were used instead of 3 noradamantanecarboxylic acid 2 79 g 16 8 mmol and 5 6 diamino 1 4 benzyloxycarbonylaminophenethyl 3 propyluracil 6 12 g 14 0 mmol obtained in reference example 1 elementary analysis for c 25 h 31 n 5 o 2 ir kbr u03bd max cm 1 1694 1657 1645 1547 1518 1493 nmr 270 mhz dmso d 6 u03b4 ppm 12 92 1h brs 6 87 2h d j 7 9 hz 6 48 2h d j 7 9 hz 4 87 2h brs 3 99 2h t j 7 9 hz 3 95 2h t j 7 4 hz 2 65 2 55 3h m 2 30 2 25 2h m 2 20 2 10 2h m 2 00 1 85 4h m 1 75 1 55 6h m 0 87 3h t j 7 4 hz 3 4 aminophenethyl 8 dicyclopropylmethyl 1 propylxanthine compound 3 0 28.