Table 2. Spin–Lattice Relaxation Time at Crystallographically Inequivalent Carbon Nuclei Sites of Prednisone, Prednisolone, Prednisolone Acetate, Methylprednisolone, and Methylprednisolone Acetate.

prednisone		prednisolone		prednisolone acetate		methylprednisolone		methylprednisolone acetate
carbon nuclei	relaxation time (s)	carbon nuclei	relaxation time (s)	carbon nuclei	relaxation time (s)	carbon nuclei	relaxation time (s)	carbon nuclei	relaxation time (s)
C20	388 ± 20	C20	211 ± 10	C20	192 ± 10	C20	180 ± 5	C20	118 ± 5
C3	600 ± 30	C3	355 ± 20	C3	306 ± 10	C3	170 ± 5	C3	164 ± 10
C5	397 ± 20	C5	262 ± 12	C5	172 ± 10	C5	70 ± 2	C5	68 ± 5
C1	422 ± 20	C1	255 ± 14	C1	212 ± 10	C1	170 ± 5	C1	162 ± 10
C2	357 ± 20	C2	285 ± 20	C2	252 ± 10	C2	165 ± 5	C2	166 ± 10
C4	418 ± 20	C4	282 ± 20	C4	210 ± 10	C4	80 ± 2	C4	72 ± 5
C17	337 ± 20	C17	200 ± 20	C17	157 ± 10	C17	116 ± 5	C17	105 ± 5
C11	388 ± 20	C11	265 ± 20	C11	233 ± 10	C11	145 ± 5	C11	133 ± 5
C21	422 ± 20	C21	190 ± 10	C21	205 ± 10	C21	145 ± 5	C21	78 ± 5
C9	264 ± 20	C9	246 ± 10	C9	214 ± 10	C9	160 ± 5	C9	146 ± 5
C14	338 ± 20	C14	246 ± 10	C14	170 ± 10	C14	120 ± 5	C14	134 ± 5
C13	187 ± 10	C13	115 ± 10	C13	50 ± 3	C13	37 ± 2	C13	45 ± 5
C10	187 ± 10	C10	135 ± 10	C10	85 ± 5	C10	110 ± 5	C10	70 ± 5
C12	400 ± 20	C12	210 ± 12	C12	170 ± 10	C12	90 ± 2	C12	109 ± 5
C7	400 ± 20	C7	270 ± 10	C7	209 ± 10	C7	115 ± 5	C7	17 ± 2
C16	408 ± 20	C16	217 ± 10	C16	230 ± 10	C16	116 ± 5	C16	96 ± 5
C6	420 ± 20	C6	236 ± 10	C6	176 ± 10	C6	30 ± 2	C6	120 ± 5
C8	420 ± 20	C8	285 ± 10	C8	185 ± 10	C8	120 ± 5	C8	120 ± 5
C15	387 ± 20	C15	242 ± 10	C15	184 ± 10	C15	120 ± 5	C15	100 ± 5
C18, C19	5 ± 2	C18, C19	5 ± 1	C18, C19	5 ± 2	C18, C19	5 ± 1	C18C19	10 ± 2
				C23	10 ± 2	C22	5 ± 1	C23	10 ± 2
				C22	206 ± 10			C22	83 ± 5
								C24	10 ± 2