aniline
anilinium arsenate
nitarsone
orthoarsenic acid
p-nitrobenzenediazonium
[4-(2-hydroxy-ethylamino)-phenyl]-arsonic acid
(4-[2]furyl-phenyl)-arsonic acid
[4-(2-bromo-propionylamino)-phenyl]-arsonic acid
[4-(3-chloro-1,4-dioxo-1,4-dihydro-[2]naphthylamino)-phenyl]-arsonic acid
{4-[(2,4-diamino-pteridin-6-ylmethyl)-amino]-phenyl}-arsonic acid