β-substituents are chemical groups attached to the β-carbon atom of a molecule. In this context, they are likely influencing the regioselectivity and stereoselectivity of pyrroline ring formation in the chlorin synthesis process.
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dibenzyl 7-(2-methoxycarbonylethyl)-5-methoxycarbonylmethyl-2,8-dimethyldipyrromethane-1,9-dicarboxylate
