N,N'-bis(1,2,3,4-tetrahydroacridin-9-yl)heptane-1,7-diamine 1,2,3,4-tetrahydroacridin-9-yl-[7-(1,2,3,4-tetrahydroacridin-9-ylamino)heptyl]amine AIDS415681 AIDS-415681 AA7