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Bilaid B is a tetrapeptide that has been found in Penicillium.¹

Bilaid B (compound 2a) is a tetrapeptide. Bilaid B resembles opioid peptides albeit with a unique, alternating LDLD amino acid configuration. [1].

1. Dekan, Z., Sianati, S., Yousuf, A., et al. A tetrapeptide class of biased analgesics from an Australian fungus targets the μ-opioid receptor Proc. Natl. Acad. Sci. USA 116(44),22353-22358(2019).