Table 2. Distribution of dimeric photoproducts (expressed as a percentage of the combined yield of quantified lesions) upon exposure of Thd to UVC light under different conditions.

Condition	Product
	<>c,s	<>t,s	<>c,a	<>t,a	Spore	(6–4)
Frozen aqueous solution	10	12	24	3	38	13
Lyophilized aqueous solution	12	22	28	7	27	4
Air-dried ethanolic solution	5	6	8	1	78	2

<>c,a, <>c,s, <>t,s and <>t,a, cis,anti, cis,syn, trans,syn and trans,anti cyclobutane dimers; (6–4), (6–4) photoproduct; spore, spore photoproduct. For the trans,syn and cis,anti cyclobutane dimers, the (6–4) and the spore photoproducts reported values represent the sum of the yield of the two diastereoisomers.