@article {34634, title = {Free Piperazic Acid as a Precursor to Nonribosomal Peptides}, journal = {J. Am. Chem. Soc.}, volume = {ASAP}, year = {2022}, author = {Wei, Zi-Wang and Niikura, Haruka and Morgan, Kalindi D. and Vacariu, C. M. and Andersen, Raymond J. and Ryan, Katherine S.} }