Robuta

https://patents.google.com/patent/US1973787A/en US1973787A - Vat dyestuffs of the benzanthrone acridine series and the process of making them -... of the https://patents.google.com/patent/DE407838C/en DE407838C - Process for the preparation of condensation products of the benzanthrone series -... for the process preparation condensation products https://www.techtransfer.nih.gov/patent/e-146-1998-1-pct-01 Benzanthrone Compounds and Antiviral Uses Thereof | Technology Transfer compounds antiviral uses technology transfer