In this work, we present the development of an open-source structure generator MAYGEN, a pure-Java constitutional isomer generator based on the principle of orderly generation described by Grund et al . We benchmark our method against the fastest available open-source solution OMG as well as against the closed-source, de facto gold standard MOLGEN. MAYGEN outperforms OMG by an order of magnitude and above but is still outperformed by MOLGEN. In an old Arabic saying, "may" refers to a drop of water, and we hope that MAYGEN will be a good contribution to the field and trigger a surge in the development of improved and faster versions eventually rivalling the best closed-source solutions and thereby serving the scientific community. The complete MAYGEN code, as well as precompiled binaries, are available at .