Sincalide: C~49~H~62~N~10~O~16~S~3~. Mw: 1143.27. (1) Caerulein, 1-de(5-oxo-L-proline)-2-de-L-glutamine-5-L-methionine-; (2) L-Aspartyl-L-tyrosyl-L-methionylglycyl-L-tryptophyl-L-methionyl-L-aspartylphenyl-L-alaninamide hydrogen sulfate (ester); (3) L-α-Aspartyl-O-sulfo-L-tyrosyl-L-methionylglycyl-L-tryptophyl-L-methionyl-L-α-aspartyl-L-phenylalaninamide. CAS-25126-32-3 (1974).