prov:value
| - X4 is ???SH or ???R1???SH; X5 is H, ???SH or ???R1???SH, provided that at least one of X4 and X5 is other than ???SH; B1 is ???CH2NHR7, ???CH2CH2NHR7, ???CH2CH2CH2NHR7, or ???CH(NH2)CH2NHR7; and R7 is H or lower alkyl, provided that when B1 is ???CH2NHR7, R7 is other than H; or a stereoisomer, prodrug, pharmaceutically-acceptable salt, or mono or polyprotonated acid salt thereof.
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