trans-(+)-2,3,4a,5,6,10b-Hexahydro-1H-naphth<2,1-b><1,4>oxazine 、 2,3;4,6-Di-O-isopropyliden-L-lyxo-hexulosonsaeure 生成 (4aR,10bR)-2,3,4a,5,6,10b-hexahydro-1H-benzo[f][1,4]benzoxazine;2-[(4R,5S)-5-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2,2-dimethyl-1,3-dioxolan-4-yl]-2-oxoacetic acid