Two forms of sarcosine sarcosinium hydrogen L-tartrate

•There are four phases in the system sarcosine+L-tartaric acid+H2O.•The structure of two polymorphs of sarcosine sarcosinium hydrogen L-tartrate is determined.•This pair represents an instance of dimorphism with the same space group and Z.•Vibrational spectra of all four phases are shown and discuss...

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