label: 20-methyl-21,22-didehydro-20,21-dihydrobotryococcene + S-adenosyl-L-methionine = 3,20-dimethyl-1,2,21,22-tetradehydro-2,3,20,21-tetrahydrobotryococcene + S-adenosyl-L-homocysteine + H(+)
label_lc: 20-methyl-21,22-didehydro-20,21-dihydrobotryococcene + s-adenosyl-l-methionine = 3,20-dimethyl-1,2,21,22-tetradehydro-2,3,20,21-tetrahydrobotryococcene + s-adenosyl-l-homocysteine + h(+)