Organic chemistry question (dimers?)?

I did a reaction using horseradish peroxidase at pH = 4 to synthesize divanillin from vanillin. I'm being asked "Why does this reaction only form a dimer, rather than going on to a trimer, tetramer, etc.? Keep in mind the following water solubilities: vanillin 0.01 g/mL, divanillin estimated 0.003... show more I did a reaction using horseradish peroxidase at pH = 4 to synthesize divanillin from vanillin. I'm being asked
"Why does this reaction only form a dimer, rather than going on to a trimer, tetramer, etc.? Keep in mind the following water solubilities: vanillin 0.01 g/mL, divanillin estimated 0.003 g/mL."

I have no idea where to start. Does it have something to do with the pH maybe? Thanks for any help.
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