Table 1: Parameters of the experiments. Unless otherwise specified, the experiments were performed with deposition/irradiation at 12 K, and the  hard UV spectrum.
Exp. Comment Ice mixture Dose $\frac{{N}_{\rm C}{\rm (HMT)}^1}{{N}_{\rm C}({\rm ice})}$ $\frac{{N}_{\rm C}{\rm (c.a.~salt)}^2}{{N}_{\rm C}({\rm ice})}$ $\frac{{N}_{\rm C}{\rm (amide)}^2}{{N}_{\rm C}({\rm ice})}$ $\frac{{N}_{\rm C}{\rm (ester)}^2}{{N}_{\rm C}({\rm ice})}$ $\frac{{N}_{\rm C}{\rm (total)}^2}{{N}_{\rm C}({\rm ice})}$
OR#   H2O:NH3:CH3OH:CO:CO2 $\frac{\rm {photon}}{\rm {molec}}$ (%) (%) (%) (%) (%)
1 standard exp. 2:1:1:1:1 0.25 6.4 $\pm$ 0.3 1.8 0.33 0.16 8.7
2 standard exp. 2:1:1:1:1 0.23 4.2 $\pm$ 0.1 1.1 0.32 0.07 5.7
3 standard exp. 2:1:1:1:1 0.26 4.4 $\pm$ 0.43 0.63 0.093 0.123 5.23
4   2:1:1:1:1 3.33 5.6 $\pm$ 0.1 1.5 1.2 0.9 9.2
5   2:1:1:1:1 0.031 2.4 $\pm$ 0.1 0.3 0.04 0.10 2.8
6 dep. at 80 K 2:1:1:1:1 0.33 7.0 $\pm$ 0.2 0.9 0.53 0.15 8.6
7 soft UV spectrum 2:1:1:1:1 0.66 7.0 $\pm$ 0.3 0.4 0.15 0.13 7.7
8 no irradiation 2:1:1:1:1 0 $\leq$0.1 $\leq$0.01 $\leq$0.05 $\leq$0.05 $\leq$0.21
9   0:1:1:0:0 0.32 0.6 $\pm$ 0.1 0.09 0.27 0.05 1.04(1.5)
10   2:1:0:0:0 0.38 $\leq$0.15 $\leq$0.015 $\leq$0.015 $\leq$0.015 $\leq$0.135
11   2:1:0:1:0 0.24 0.6 $\pm$ 0.1 1.6 2.5 0.24 4.9
12   2:1:0:1:1 0.26 $\leq$0.1 0.3 0.78 0.02 1.2
13   2:1:1:0:0 0.25 0.4 $\pm$ 0.2 0.08 $\leq$0.01 $\leq$0.01 0.54(0.8)
14   20:1:0:1:0 0.15 1.3 $\pm$ 0.1 0.3 1.1 $\leq$0.01 2.7
15   20:1:1:0:0 0.20 17.1 $\pm$ 1.7 5.1 5.2 1.0 28.4
16   20:1:1:1:1 0.22 15.0 $\pm$ 0.7 0.3 0.28 0.11 15.7
1 Values are the average of the column density values obtained from the 1007 and 1236 cm-1 features of HMT with band strengths shown in Table 3. Errorbars give the difference between both values.
2 Estimated errors obtained by integration using different baselines are $\leq$20% of these values. Feature positions are 1586 for c.a. salts, 1680 for amides and 1742 cm-1 for esters. Band strengths used for integration are given in Table 3.
3 For this experiment the last step of the warm-up was slightly different. At 298 K the cryostat was switched off as usual, but the heater was kept on, set at 298 K, to guarantee the residue was monitored at constant temperature.
4 In addition to the listed species, the spectrum shows a large abundance of POM-like species. The values in brackets include the POM abundances assuming the band strength of pure POM (Table 3).
5 In this experiment no C-containing ice was deposited, values give an upper limit of the carbon column density of the products relative to the total column density of the original ice deposition.

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