Fig. 2
From: Molecular generation by Fast Assembly of (Deep)SMILES fragments
Two fragmentations of folic acid (vitamin B\(_9\)). Under each mixture of fragments, the (not canonical but randomized) SMILES and corresponding DeepSMILES-without-ring-openings are shown. Tagged cleaved bonds (in black) are the wildcard atom pairs [x*][y*] with the isotope numbers x and y encoding atom types directly to the left and right of the cleaved bond. Colors indicate the seed fragment (in green), the first branch fragment (in orange) and the second branch fragment (in purple)