Welcome to Spectral Database for Organic Compounds, SDBS.
This is a free site organized by National Institute of Advanced Industrial Science and Technology (AIST), Japan.
NMR:
 T.Yamazaki, M.Nabeshima, T.Saito, T.Yamaji, K.Hayamizu, M.Yanagisawa and O.Yamamoto
MS:
 S.Matsuyama, C.Ono and N.Wasada
ESR:
 K.Someno
IR:
 S.Matsuyama, Y.Takizawa, S.Kinugasa, K.Tanabe and T.Tamura
Raman: K.Tanabe and J.Hiraishi