[Ethyl-(toluene-4-sulfonyl)-aminocarbonyl]-sulfamic acid heptyl ester
[Ethyl-(toluene-4-sulfonyl)-aminocarbonyl]-sulfamic acid allyl ester
[Ethyl-(toluene-4-sulfonyl)-aminocarbonyl]-sulfamic acid isobutyl ester
[Ethyl-(toluene-4-sulfonyl)-aminocarbonyl]-sulfamic acid methyl ester