Chian C. Chiang

X-Ray crystal and molecular structure of kodo-cytochalasin-1

Kodo-cytochalasin-1 and cytochalasin H have been shown to be identical in structure and stereochemistry by single-crystal X-ray diffraction analysis; an inadvertant error in the stereochemistry at C(18) reported previously for cytochalasin H is corrected.

Lasalocid crystallized from methanol: spectroscopic and X-ray structural evidence for two structures

Results of i.r. absorption and Raman scattering data and X-ray crystallographic data for lasalocid crystallized from methanol have enabled identification of two distinct structures for the 1 : 1 lasalocid–methanolate complex. Both have space group P212121 but possess a different molecular geometry. The ketone carbonyl stretching frequency in the 1 700–1 730 cm–1 region is a sensitive indicator of crystalline modification.