H⁺ + N-[(R)-4-phosphopantothenoyl]-L-cysteine --> CO₂ + D-pantetheine 4'-phosphate (according to UniProt)

(R)-4'-phosphopantothenate + CTP + L-cysteine --> CMP + diphosphate + H⁺ + N-[(R)-4-phosphopantothenoyl]-L-cysteine (according to UniProt)