(4S)-4,5-dihydro-4-ethoxycarbonyloxy-2H-furo[2,3-c]pyran-2-one

乙酸酐

2H-呋喃并[2,3-c]吡喃-2-酮

(4S,7S,7aR)-4,7-diacetoxy-4,5,7,7a-tetrahydro-2H-furo[2,3-c]pyran-2-one

(4S)-4-acetoxy-4,5-dihydro-2H-furo[2,3-c]pyran-2-one