| 摘要 |
The invention provides esterified α-galactosylceramides effective for cancer treatment and the like, and a medicament containing same. In particular, the invention relates to a compound represented by the formula (I): wherein R1 is a hydrocarbon group having a carbon number of 1 to 30, R2 is a hydrocarbon group having a carbon number of 1 to 20, R3 is a hydrogen atom or hydrocarbon group having a carbon number of 1 to 5, R4 and R5 are the same or different and each is a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 5, or R4 and R5 in combination form a divalent hydrocarbon group having a carbon number of 1 to 5, and optionally form a ring structure together with the adjacent ethylenedioxy, or a salt thereof.
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