With regards to the screening of electron mobilities, we find that a number of the hypothetical molecules are predicted to give higher electron mobilities than molecule 1. Molecules 4 and 5 are most promising among the 28 molecules that we considered. Molecule 5 has the second lowest reorganization energy and a crystal energy landscape that is dominated by sheet-like crystal packings, leading to very high electron mobility in some its predicted crystal structures, including its global lattice energy minimum and a higher energy crystal structure that gives the highest electron mobility across all 28 crystal structure landscapes. Molecule 4 is attractive because of high electron mobility in the global minimum energy crystal structure and a large energy gap to the next hypothetical crystal structure; the global energy minimum is highly likely to be observed in this case.