11 ml of isopropyl alcohol was added 1 11 g of n propionyl l carnosine at 60 u00b0 c 1 3 g quantitative yield of an n propionyl l carnosine aluminum salt was obtained in the same way as in example 3 u03b1 d 25 11 4 u00b0 c c 3 in h 2 o ir u03bd max kbr cm 1 3400 oh 1640 c u2550 o 1540 1400 nmr d 2 o u03b4 1 02 3h t coch 2 ch 3 2 11 2h q coch 2 ch 3 2 40 2h t coch 2 ch 2 nh str25 3 28 2h t coch 2 ch 2 nh str26 7 08 8 26 1h u00d7 2 s u00d7 2 imidazole ring protons elemental analysis as c 12 h 17 n 4 o 4 al oh 2 calculated c 42 10 h 5 61 n 16 37 found c 41 88 h 5 83 n 16 12 to a solution of a 0 72 g of aluminum isopropoxide dissolved in 15 ml of isopropyl alcohol was added 1 97 g of n propionyl l carnosine at 60 u00b0 c thereafter 2 1 g quantitative yield on an n propionyl l carnosine aluminum salt was obtained as colorless power in the same way as in example 3 u03b1 d 25 14 5 u00b0 c c 1 in h 2 ir u03bd max kbr cm 1 3400 oh 1640 co 1540 nmr d 2 o u03b4 1 02 3h t ch 2 ch 3.