R7 also includes aminoalkanyl, the alkanyl having from 1 to about 3 carbon atoms, preferably methyl, ethyl, or isopropyl, the alkanyl being substituted with one amino, such amino being unsubstituted or substituted with 1 or 2, preferably 1, alkanyl having from 1 to about 3 carbon atoms, preferably ethyl or especially methyl.