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US 4,734,493 AGranted
Novel anthracycline antibiotics
AssigneeSanraku Incorporated
InventorsAkihiro Yoshimoto, Osamu Jodo, Yoshio Watanabe, Tomoyuki Ishikura, Tsutomu Sawa, Tomio Takeuchi, Hamao Umezawa
Life of this patent
Estimating the term…
Abstract
The antibiotics designated obelmycins exhibit high proliferation inhibiting action against leukemia cells and are effective as anti-cancer agents.
Claims5
An anthracycline antibiotic represented by the formula:
- ##STR6## wherein R.sub.1 represents a substituent shown by the formula:
- ##STR7## and R.sub.2 represents a hydroxyl group.
An anthracycline antibiotic represented by the formula:
- ##STR8## wherein R.sub.1 and R.sub.2 each represent a substituent shown by the formula:
- ##STR9##
An anthracycline antibiotic represented by the formula:
- ##STR10## wherein R.sub.1 represents a substituent shown by the formula:
- ##STR11## and R.sub.2 represents a substituent shown by the formula:
- ##STR12##
An anthracycline antibiotic represented by the formula:
- ##STR13## wherein R.sub.1 represents a hydrogen atom and R.sub.2 represents a substituent shown by the formula:
- ##STR14##
An anthracycline antibiotic represented by the formula:
- ##STR15## wherein R.sub.1 represents a hydrogen atom and R.sub.2 represents a substituent shown by the formula:
- ##STR16##
Dependencies are inferred from the claim text.