The compound CO2S3 is commonly known as carbon disulfide.
Explanation: The formula CO2S3 indicates that the compound consists of one carbon (C) atom, two oxygen (O) atoms, and three sulfur (S) atoms. When naming molecular compounds, the number of each type of atom is expressed using prefixes. Here, the ‘di-‘ prefix in ‘disulfide’ denotes the presence of two sulfur atoms. However, it’s worth noting that CO2S3 may not be a well-known or common compound, but given its elements, the name primarily describes its basic structure.