甲醇

3-甲基-2-吡啶甲酸

四甲基锡

methyl 3-(trifluoromethylsulfonyloxy)-pyridine-2-carboxylate

5,9,9-trimethyl-7,11-dioxo-8,10-dioxa-1-azaspiro[5.5]undec-3-en-1-yl 4-methylbenzenesulfonate