4(S)-4-ethyl-4-hydroxy-6-chloro-4,7-dihydro-1H-pyrano[3,4-c]pyridin-3,8-dione

2-氯-6-甲氧基吡啶

6-chloro-4-iodo-2-methoxy-3-pyridinecarboxaldehyde

2-chloro-4-iodo-6-methoxy-5-(methoxymethyl)pyridine

(S)-2-(6-chloro-2-methoxy-3-(methoxymethyl)pyridin-4-yl)-2-hydroxybutanoic acid