Compounds of the formula wherein the following isomeric forms can be formed in which Q represents a bond, -CH 2 -, -CH 2 CH 2 - or -CH=CH-, Y represents the groups -OR 6, -CO 2 R 7, -CH=CH 2, cyano, -CR 10 =O, -CR 10 =N-OR 13, -CH(OR 17 OR 18), S p R 6, -SCN, -CONR 8 R 9, -CH 2,-CH R 6, bromine, -O(C=O)R 10, -S(C=P)R 10, -O(C=O)NR 11 R 12, or represents the group W, G represents hydrogen, ethyl, benzyl (a) or represents one of the groups R 1 represents methyl or ethyl, R 2 represents methyl, R 3 represents hydrogen, R 4 represents methyl or ethyl, R 5 represents hydrogen, R 6 represents hydrogen, methyl, ethyl, -CH 2 -CH(CH 3) 2, -CH 2 -CH=CH 2, trifluoromethyl, methoxymethyl, 2-benzoxazolyl, 4,5-dimethylthiazol-2-yl, 2- oxazolyl, 2-tetrahydrofuryl or the 2-pyranyl group, R 7 represents hydrogen, methyl or ethyl, R 8 represents hydrogen or methyl, R 9 represents hydrogen or methyl, or R 8 and R 9 together with the nitrogen atom represent the group R 10 represents hydrogen, methyl, t-butyl or trifluoromethyl, R 11 represents hydrogen or methyl, R 12 represents hydrogen, methyl, benzyl or phenyl, R 13 represents hydrogen, methyl, isopropyl, CH 2 CH=CCl 2, -CH 2 CH=CH 2, -CH 2 C≡CH or -CH 2 C 3 H 5, R 17 represents methyl or ethyl, R 18 represents methyl or ethyl, R 19 represents ethyl, tert-butyl or isopropyl, R 20 represents methyl, ethyl or isopropyl, p represents 0 or 2. Q represents a bond, -CH 2 -, -CH 2 CH 2 - or -CH=CH-, Y represents the groups -OR 6, -CO 2 R 7, -CH=CH 2, cyano, -CR 10 =O, -CR 10 =N-OR 13, -CH(OR 17 OR 18), S p R 6, -SCN, -CONR 8 R 9, -CH 2,-CH R 6, bromine, -O(C=O)R 10, -S(C=P)R 10, -O(C=O)NR 11 R 12, or represents the group W, G represents hydrogen, ethyl, benzyl (a) or represents one of the groups R 1 represents methyl or ethyl, R 2 represents methyl, R 3 represents hydrogen, R 4 represents methyl or ethyl, R 5 represents hydrogen, R 6 represents hydrogen, methyl, ethyl, -CH 2 -CH(CH 3) 2, -CH 2 -CH=CH 2, trifluoromethyl, methoxymethyl, 2-benzoxazolyl, 4,5-dimethylthiazol-2-yl, 2- oxazolyl, 2-tetrahydrofuryl or the 2-pyranyl group, R 7 represents hydrogen, methyl or ethyl, R 8 represents hydrogen or methyl, R 9 represents hydrogen or methyl, or R 8 and R 9 together with the nitrogen atom represent the group R 10 represents hydrogen, methyl, t-butyl or trifluoromethyl, R 11 represents hydrogen or methyl, R 12 represents hydrogen, methyl, benzyl or phenyl, R 13 represents hydrogen, methyl, isopropyl, CH 2 CH=CCl 2, -CH 2 CH=CH 2, -CH 2 C≡CH or -CH 2 C 3 H 5, R 17 represents methyl or ethyl, R 18 represents methyl or ethyl, R 19 represents ethyl, tert-butyl or isopropyl, R 20 represents methyl, ethyl or isopropyl, p represents 0 or 2. R 1 represents methyl or ethyl, R 2 represents methyl, R 3 represents hydrogen, R 4 represents methyl or ethyl, R 5 represents hydrogen, R 6 represents hydrogen, methyl, ethyl, -CH 2 -CH(CH 3) 2, -CH 2 -CH=CH 2, trifluoromethyl, methoxymethyl, 2-benzoxazolyl, 4,5-dimethylthiazol-2-yl, 2- oxazolyl, 2-tetrahydrofuryl or the 2-pyranyl group, R 7 represents hydrogen, methyl or ethyl, R 8 represents hydrogen or methyl, R 9 represents hydrogen or methyl, or R 8 and R 9 together with the nitrogen atom represent the group R 10 represents hydrogen, methyl, t-butyl or trifluoromethyl, R 11 represents hydrogen or methyl, R 12 represents hydrogen, methyl, benzyl or phenyl, R 13 represents hydrogen, methyl, isopropyl, CH 2 CH=CCl 2, -CH 2 CH=CH 2, -CH 2 C≡CH or -CH 2 C 3 H 5, R 17 represents methyl or ethyl, R 18 represents methyl or ethyl, R 19 represents ethyl, tert-butyl or isopropyl, R 20 represents methyl, ethyl or isopropyl, p represents 0 or 2.