X-press Tag is an N-terminal leader peptide; this N-terminal peptide contains a polyhistidine sequence, the Xpress epitope (part of bacteriophage T7 gene 10 protein) and an enterokinase cleavage site. Anti-Xpress antibodies recognize the Xpress epitope sequence found in this leader peptide.

3,4'-DiHydroxy-3',5'-dimethoxypropiophenone (beta-Hydroxypropiosyringone) (compound 12) 是一种酚类化合物，存在于 Psychotria yunnanensis 中。

2-Hydroxyl emodin-1-methyl ether (Compound 5) 是一种可以从决明子 Cassia obtusifolia 种子中分离得到的蒽醌类化合物。