6-nitro-1,3-benzodioxole-5-carbaldehyde
Toluene-4-sulfonic acid 1-methyl-2-{(toluene-4-sulfonyl)-[6-(toluene-4-sulfonylamino)-benzo[1,3]dioxol-5-ylmethyl]-amino}-ethyl ester
Toluene-4-sulfonic acid 2-{(toluene-4-sulfonyl)-[6-(toluene-4-sulfonylamino)-benzo[1,3]dioxol-5-ylmethyl]-amino}-ethyl ester