Table 1. Ponazuril stability information for 84 days after storage at −80 °C.

	Concentration at different days of storage
Starting conc.	Day 1a	Day 7	Day 14	Day 21	Day 28	Day 35	Day 42	Day 49	Day 56	Day 63	Day 70	Day 77	Day 84
0.3	0.3	0.3	0.3	0.3	0.3	0.3	0.291	0.291	0.294	0.294	0.282	0.294	0.273
7.5	7.5	7.5	7.5	7.5	7.5	7.05	7.05	7.2	7.05	7.1	7.0	6.8	6.8
15	15.0	15.0	15.0	15.0	15.0	14.4	14.85	14.85	14.25	14.55	14.7	13.95	14.85
	Percentage change in concentration from starting concentration
0.3	0	0	0	0	0	0	−3	−3	−2	−.2	−6	−2	−9
7.5	0	0	0	0	0	−6	−6	−4	−6	−5	−6	−9	−9
15	0	0	0	0	0	−4	−1	−1	−5	−3	−2	−7	−1

Notes.

Concentration results reported in µg/mL; n = 1.

^aDay 1 samples were not frozen but analyzed immediately after spiking.