By addressing the relative stereochemistry of the four acyclic portions via organic synthesis, the complete relative stereochemistry of maitotoxin (MTX) has been established as 1B. The relative stereochemistry of the C. 1-C. 15 portion was elucidated via a two-phase approach:(1) the synthesis of the eight diastereomers possible for model C, representing the C. 1-C. 11 portion, and the eight diastereomers possible for model D, representing the C. ...