The CYANA Webportal service allows three types of NMR structure calculations. In the basic type, structure calculations can be performed using conformational restraints. It is assumed that the NOEs have already been assigned and converted to upper distance bounds. In this case, no automated assignment and callibration of NOEs is performed. Unambiguous assigned NOESY peak lists can be given as input in the manual type. NOESY peak assignment is possible by using the automatic type, for which there is an option to keep the (partially) assigned peak values. One needs a CYANA license to use this portal. For enquiries related to the CYANA license, please contact Peter GŁntert. For more information, see the CYANA reference manual.