3,3A,6,6A-Tetrahydrofuro[3,4-b]furan derivatives and anti-ulcer
3-Phenyl-2-thioxo-2H,5H-pyrano[3,2-c][I]benzopyran-5-one derivat
3H-Dihydrofuranone-2 derivatives and pharmaceutical use thereof
3H-Dihydrofuranone-2 derivatives and pharmaceutical use thereof