1.HOOC- COOH CH CH COOH NO NO 2 3 C(CH3)3 4 C-NH〈NO 5.(cH3)c〈》CooH6.02N 入NO OOH 7 8 > COOH 23 February 202123 February 2021 4 HO O C C O O H C H 3 C H 3 C ( C H 3 ) 3 N O 2 C l CH 3 N O 2 C O O H C l O 2N C NH N O2 O ( C H 3 ) 3 C C O OH O 2 N C N O 2 O O N O 2 C O O H C 2 H5 C O OH 1. 2. 3. 4. 5. 6. 7. 8