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 O-tigloyltransferase"
"13-hydroxylupanine o-tigloyltransferase"