| 摘要 |
Patent No. 594671 Disclosed is a composition comprising formula I and optionally salts thereof: where R1 is CnH2n+1, wherein n=0 to 12; benzyl; or H; where R2 is a C4 to C22 alkyl; where R3 is CnH2n+1, wherein n=0 to 12; benzyl; or H; where X- is a sulfate and wherein X- is only present when both R1 and R3 are present; where Y = (CH2)n, wherein n is 1 to 8; and wherein R3 and R1 cannot be hydrogen at the same time.
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