This refers to the ability to control which specific position on the aromatic ring the reaction occurs, leading to the desired product. In this context, it means that the synthesis method is efficient at directing the reaction to specific positions on the benzoheterocycle.
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1,3-diphenyl-6,7-dihydro-3H-naphtho[1,2-e]indazole
(Z)-[{1-(phenylseleno)-1-hexen-1-yl}sulfinyl]benzene
