13-hydroxylupanine + (2E)-2-methylbut-2-enoyl-CoA <=> 13-(2-methylcrotonoyloxy)lupanine + CoA
13-hydroxylupanine + (2e)-2-methylbut-2-enoyl-coa <=> 13-(2-methylcrotonoyloxy)lupanine + coa
13-hydroxylupanine + (2E)-2-methylbut-2-enoyl-CoA <=> 13-(2-methylcrotonoyloxy)lupanine + CoA
13-hydroxylupanine + (2e)-2-methylbut-2-enoyl-coa <=> 13-(2-methylcrotonoyloxy)lupanine + coa