34071_RIEDEL Epoxytrichothecene Mycotoxin T 2 T2-Toxin solution 12,13-Epoxytrichothec-9-ene-3,4,8,15-tetrol-4,15-diacetate-8-isovalerate 4beta,15-Diacetoxy-3alpha-hydroxy-8alpha-(3-methylbutyryloxy)-12,13-epoxytrichothec-9-ene T4887_SIGMA