Trabectedin is an antineoplastic drug used to treat certain types of cancer. Trabectedin impurities refer to any unwanted substances that may be present in the drug, either as a result of the manufacturing process or due to degradation over time. The identification and quantification of these impurities are critical to ensuring the safety and efficacy of the drug. Regulatory bodies require strict limits on the levels of impurities allowed in drugs, and manufacturers must take steps to minimize their presence.