label: kaempferol + S-adenosyl-L-methionine => kaempferol 7-methyl ether + S-adenosyl-L-homocysteine + H(+)
label_lc: kaempferol + s-adenosyl-l-methionine => kaempferol 7-methyl ether + s-adenosyl-l-homocysteine + h(+)