prov:value
| - For example, a method for producing a compound having the formula VA is provided where R1, R3, Z1, Z2, Z3, R4, R5, and R6 have any of the values described above with respect to compounds of formula IA and embodiments of compounds of formula IA, and Y1 is selected from the group consisting of NO2, a protected amine group, a halogen such as Cl, F, Br, or I, an ???NCS, and an N3 group.
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