The molecule (3aR,4S,7R,7aS)-4,7-methano-1H-isoindole-1,3(2H)-dione, commonly referred to as oxindole, is a bicyclic organic compound that features a five-membered ring fused to a six-membered ring, with a methano bridge connecting the two rings at the 3a and 7a positions. The molecule possesses two chiral centers at the 4 and 7 positions, giving rise to four possible stereoisomers.