These compounds had similar, weak herbicidal activity similar to that found with the lead compound. It has herbicidal properties killing young seedlings of both monocot and dicot species. Because of the weak herbicidal activity, work on other analogs was not pursued. It is a photosynthesis inhibitor with algaecidal and herbicidal effects. Both were useful in making pigments and both had herbicidal properties. Years later, the molecule was found to exhibit herbicidal activity. Instead, the USDA continues to suggest the use of herbicidal chemicals. Specifically, apicoplasts' plant-like properties provide a target for herbicidal drugs.