7a-bromo-3-methyl-5-(phenylthio)-4,5,7,7a-tetrahydro-2H-furo[2,3-c]pyran-2-one

4-thioxo-4H-pyran-3-yl-2-chloropropanoate

3-bromo-2H-furo[2,3-c]pyran-2-one

甲基硼酸

2-oxo-2H-furo[2,3-c]pyran-3-carbaldehyde