JSON body example ``` { "engine": "nmrdb.org or nmrshift or nmrxiv-preduct-v1" "structure": " CDK 09012310592D 1 0 0 0 0 0 0 0 0 0999 V2000 0.0000 0.0000 0.0000 C 0 0 0 0 0 0 0 0 0 0 0 0 M END", "options": { "spectra" : ["proton", "carbon"] } } ```