N 3 2 4 July 8, 2019 16 32 64 128 N 2 3 4 5 N 3 4n 2 N 3 4n 2 4n 1 N 2 3 4 5 6 1 n 2 3 4 5 1 n 2 3 4 5 gear pattern bikes 1 n 2 3 4 5 6 tattoo 1 n 2 3 4 5 6 motorcycle N phenyl 1 2 3 4 tetrahydroisoquinoline N 0 1 2 3 4 1 n 2 3 4 5 6 N 3 )( 4n 2 14n 7 N 2 3 4 5n 6 21 N 3 4n 2 60n 3 n 2 46