[molecular_function] 2-polyprenyl-6-methoxy-1,4-benzoquinone methyltransferase activity <sep> demethylmenaquinone methyltransferase activity <sep> S-adenosylmethionine:2-demethylmenaquinol methyltransferase activity <sep> S-adenosylmethionine:2-demethylmenaquinol-7 methyltransferase activity <sep> S-adenosylmethionine:2-demethylquinol-8 methyltransferase activity