Tubulysin Aintermediate-1 is an intermediate in the synthesis of the cytotoxic peptide Tubulysin A. Tubulysin A (TubA) acts as an antibiotic (antibiotic), anti-microtubule toxins (anti-microtubule toxins), and apoptosis (apoptosis) inducer, which can be isolated from myxobacteria. It exhibits anti-angiogenic, anti-microtubule, anti-mitotic, and anti-proliferative properties, effectively blocking cells in the G2/M phase, inhibiting tubulin polymerization, and inducing depolymerization of isolated microtubules. Tubulysin A serves as an ADC Cytotoxin (ADC Cytotoxin) in the synthesis of ADCs.