prov:value
| - nds represented in dotted lines, if p is zero, are absent; Y1 is O, S or CH2;Y2 is O; with the proviso that (Y1)n???(Y2)m does not include O???O, or S???O groups; each of R1, R2 and R3, independently of the others, is hydrogen, lower alkyl, especially methyl, ethyl, n-propyl, isopropyl or tert-butyl, lower alkenyl, especially isopropenyl, hydroxy-lower alkyl, especially hydroxy-propyl, lower alkox
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