- Para to ortho repositioning of the arsenical moiety of the angiogenesis inhibitor 4-(N-(S-glutathionylacetyl)amino)phenylarsenoxide results in a markedly increased cellular accumulation and antiproliferative activity. Dilda, P.J., Decollogne, S., Rossiter-Thornton, M., Hogg, P.J. Cancer Res. (2005)