Comparison of azacyclic urea A-98881 as HIV-1 protease inhibitor with cage dimeric N-benzyl 4-(4-methoxyphenyl)-1, 4- dihydropyridine as representative of a novel class of HIV-1 protease inhibitors: A molecular modeling study. - Andreas Hilgeroth; Romy Fleischer; Michael Wiese; Frank W. Heinemann (J. Comput. Aided Mol. Des., 1999)