1 73G Butyl 2-[2,3-bis(oxidanylidene)indol-1-yl]ethanoate 1.000 2 WZX Ethyl 2-(3-oxidanylidene-2,4-dihydroquinoxalin-1-yl)ethanoate 0.714 3 XXL Ethyl (3-oxo-2,3-dihydro-4h-1,4-benzoxazin-4-yl)acetate 0.714