(2R)-N-<(2S)-2-<amino>pent-4-en-1-oyl>bornane-10,2 sultam

ethyl 2-acetamido-2-(ethoxycarbonyl)-4-pentenoate

ethyl 2-(acetamido)-4-pentenoate

甲基(1-氨基-1-氧代-4-戊烯-2-基)氨基甲酸酯