We do not have stereospecific assignments.
This means that all HB2/HB3 assignments as well
as LEU CD1/CD2 type assignments are ambiguous.

Proceedings of the National Academy of Sciences of the United States of America
A β-barrel for oil transport through lipid membranes: Dynamic NMR structures of AlkL.

Solid-state NMR structure of outer membrane protein AlkL in DMPC lipid bilayers

0.5 w/w [U-13C; U-15N] Outer membrane protein AlkL, Water
0.5 w/w [U-13C; U-15N; U-2H] Outer membrane protein AlkL, Water
Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax