prov:value
| - The compound of claim 12 wherein R2 is --R6 --(CH2)t NR5 C(NR5)(NR3)2, --R6 --CH2 --CHR31 --N(R3)2, --R6 --(R7)v --N(R3)2, --R6 --(CH2)t --N(R3)2, --(CH2)1-2 --O--(CH2)t --N(R3)2, ##STR48## R3 is independently --H, --CH3, --CH2 CH3, --(CH2)w --N(R33)2 or a protecting group, or both R3 together are a protecting group, or when R2 is --R6 --(CH2)t --N(R3)2, one R3 is --H, --CH2 CH3, a protecting grou
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