甲醇   、                                                                                      
ethyl-(bis-O-methanesulfonyl-2,3-dideoxy-α-D-erythro-hex-2-enopyranoside)   、                                                                                      
丙酮   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid   、                                                                                      alkaline earth salt of/the/ methylsulfuric acid                                                                                                                                                                                                                                                                                                          生成                                                 (2
S)-
trans-2-ethoxy-6-methanesulfonyloximethyl-tetrahydro-pyran