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Mass spectra and electrospray ionization of atRA and 9-cis-RA standards. A, AtRA standard molecular weight is determined to be 299.1 m/z. B, Electrospray ionization of atRA. C, 9-cis-RA standard molecular weight is determined to be 299.1 m/z. D, Electrospray ionization of 9-cis-RA.
