6-azanyl-2-[[(1~{R},2~{S},6~{S},9~{R})-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.0^{2,6}]dodecan-6-yl]methylamino]-3,7-dihydroimidazo[4,5-g]quinazolin-8-one

P28720 — Queuine tRNA-ribosyltransferase