Rabeprazole-d₄ Sodium Salt (benzimidazole-4,5,6,7-d₄)

Ractopamine-d₃ HCl (2-hydroxyethyl-1,1,2-d₃) (mixture of diastereomers)

Ractopamine-d₆ HCl (1-methyl-d₃-propyl-1,2,2-d₃) (mixture of diastereomers)

Ranitidine-d₆ HCl (N,N-dimethyl-d₆)

(±)-Ranolazine-d₈ 2HCl (piperazine-d₈)

(S)-(+)-Repaglinide-d₅ (ethoxy-d₅)

Rimantadine-d₄ HCl (ethyl-d₄)

(S)-(-)-Rivastigmine-d₆ L-Tartrate (N,N-dimethyl-d₆)

Robenidine-d₈ HCl [bis(phenyl-d₄)]

Roflumilast-d₄ (cyclopropyl-2,2,3,3-d₄)

Ropinirole-d₁₄ HCl (di-n-propyl-d₁₄)