prov:value
| - X is selected from ???CH2???, ???O???, and ???S???; X2 is selected from ???F, ???Cl, ???Br, and ???I; n is selected from 0, 1, 2 and 3; and PG is a suitable protecting group; or any stereoisomer, mixture of stereoisomers, prodrug, metabolite, crystalline form, non-crystalline form, hydrate, solvate, or salt thereof;
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