(3E)-3-(2,5-dimethyl-1,1-dioxo-1,4,2-dithiazolidin-3-ylidene)-1,1-di(propan-2-yl)thiourea

tert-butyl N-(1-ethylsulfonylpiperidin-4-yl)carbamate

N-diazoethanesulfonamide

1-ethylsulfonylpyrrolidine

钡二乙烷磺酸酯