Two novel ansamitocin analogs from Actinosynnema pretiosum

Two novel ansamitocin analogs from <i>Actinosynnema pretiosum</i> A Novel Amide N-Glycoside of Ansamitocins from Actinosynnema pretiosum First Ring‐Expanded Maytansin Lactone Accessed by a New Mutasynthetic Variant Ansamitocin, a group of novel maytansinoid antibiotics with antitumour properties from Nocardia Two New <i>N</i>‐(<i>O</i>‐Carbamoylglucopyranosyl)‐<i>N</i>‐dimethylansamitocins from <i>Actinosynnema pretiosum</i> Antitumor Principles in Mosses: the First Isolation and Identification of Maytansinoids, Including a Novel 15-Methoxyansamitocin P-3 The Ansacarbamitocins: Polar Ansamitocin Derivatives The Ansacarbamitocins: Polar Ansamitocin Derivatives Two New Maytansinoids from <i>Maytenus buchananii</i> Two New Maytansinoids from Maytenus buchananii