NMR Reference & Data Repositories
From NMR Wiki
Conventions and Nomenclatures
Proteins and Nucleic Acids (IUPAC recommendation, tables maintained by BMRB and CCPN)
PDB file format. v2.3 v3.0 v3.2
Reference data
Aminoacid data basic info & random coil shifts • chemical shift statistics
Table of element's NMR properties