[R,(+)]-2-Hydroxypentanedioic acid zinc salt
[R,(+)]-2-Hydroxypentanedioic acid zinc salt ??
??
[R,(+)]-2-Hydroxypentanedioic acid zinc salt C??? ??, ??, ??
[R,(+)]-2-Hydroxypentanedioic acid zinc salt ?? ?? ? ???
???
?? ??
[R,(+)]-2-Hydroxypentanedioic acid zinc salt ?? ??
???( 0)?? ??