G3381 SIGMA Geldanamycin from Streptomyces hygroscopicus ≥98% (HPLC), powder CAS Number 30562-34-6 Empirical Formula (Hill Notation) C29H40N2O9 Molecular Weight 560.64 assay ≥98% (HPLC) form powder color yellow to orange solubility DMSO: soluble storage temp. −20°C