主权项 |
1. A compound of Formula I: wherein: R1 is H or Z; R2 is —N(Z)2, —N(CH2—O—Z)2, —N(CH2CH2—O—Z)2, —N(CH2OH)2, —N(CH2NH2)2, —N(CH2CH2OH)2, OH, NH2, —O—Z, —CH2—O—Z, —CH2CH2—O—Z, —CH2OH, —CH2NH2, —O—C—(CH3)3, or —O-(alkylene)-CH3; R3 is —N(Z)2, —N(CH2—O—Z)2, —N(CH2CH2—O—Z)2, —N(CH2OH)2, —N(CH2NH2)2, —N(CH2CH2OH)2, OH, NH2, —O—Z, —CH2—O—Z, —CH2CH2—O—Z, —CH2OH, —CH2NH2, —O—C—(CH3)3, or —O-(alkylene)-CH3; R4 is —N(Z)2, —N(CH2—O—Z)2, —N(CH2CH2—O—Z)2, —N(CH2OH)2, —N(CH2NH2)2, —N(CH2CH2OH)2, OH, NH2, —O—Z, —CH2—O—Z, —CH2CH2—O—Z, —CH2OH, —CH2NH2, —O—C—(CH3)3, or —O-(alkylene)-CH3; and Z is |