| abstract |
The present invention relates to a compound having the structure of formula (I):n n n [Formula 1]n n n n n n n n [Meal,n n n a) each R is independently alkyl having 1 to 7 carbon atoms;n n n b) Z is 0 or N-X;n n n c) X is hydrogen, alkyl having 1 to 7 carbon atoms; Is selected from the group consisting of C (O) Y, C (S) Y, and SO 2 Y;n n n d) Y is selected from the group consisting of R ', OR' and NR ' 2 ;n n n e) R 'is selected from the group consisting of hydrogen, alkyl having 1 to 7 carbon atoms, and phenyl. |