A new antitumor antibiotic, FR900840, was isolated from a culture broth of Streptomyces strain No. 8727 as a pale yellowish prism and the molecular formula was determined to be C7H11N3O5. The antibiotic exhibited prominent antitumor effects on human tumor cell lines both in vitro and in vivo.
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Nishimura et al. (1989) studied this question.