Table 1.

Hyperpolarisation levels and lifetimes for isotopologues 1–4.

Substrate	Net 13C polarisation [%]	Thermally polarised lifetimes T 1 [s]	Hyperpolarised lifetimes T 1 and T LLS [s]
1	C1: 0.96	C1: 35.4±0.5	C1 T 1: 32.5±4.7
2	C2: 0.60	C2: 20.1±0.5	C2 T 1: 18.2±3.0
3	C1: 1.85 C2: 1.65	C1: 33.6±0.5 C2: 21.2±0.4	T LLS (HF): 43.5±0.8 T LLS (LF): 85.4±8.5
4	C1: 0.55 C2: 0.35 C3: 0.22	C1: 31.4±1.2 C2: 8.6±1.5 C3: 3.3±0.7	C1 T 1: 28.5±5.5 C2 T 1: 15.7±1.9 C3 T 1: 3.0±2.5